• Register Today It's free! This box and some ads will disappear once registered!

^^Searches ExplorerForum.com^^

Solved: Engine oil and filter for 4.0 SOHC - 5W-20 or 5W-30?

albator

New Member
Joined
January 14, 2020
Messages
49
Reaction score
3
City, State
Bonny Doon, CA
Year, Model & Trim Level
1999 Mercury Mountaineer
Which oil do you recommend?
5W-20 or 5W30?
Synthetic, mix or non-synthetic?
What about those "high-mileage" oils?
My engine is 1999 4.0 SOHC, 200k miles

At Costco they have either the Mobil-1 High-Mileage, or the Kirkland oil
Both full synthetic, Costco is half price.

What about the oil filter?
Motorcraft or aftermarket?
- E7TZ-6731A (FL-1A)
- D9AZ-6731A (FL-1HP)

Filter price: FL-1HP cost 3 times the price of FL-1A)
 
Last edited:
Join the Elite Explorers for $20.

Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private Conversations, and more. Join Today. Your support is greatly appreciated.


RickOTR

Active Member
Joined
January 4, 2000
Messages
920
Reaction score
40
Year, Model & Trim Level
97 Sport 4X4
Ford now recommends using what was originally made for the vehicle which is 5w30. I tried 5w20 but saw no difference so I went back to 5w30 using Mobil 1 full Synthetic not the high mileage stuff. Some people swear by the Royal Purple and Amsoil but once again saw no real benefit from using them IMO. I always use the Motorcraft FL-1 filter nothing else. I have 672,00 miles on the original engine and she still purrs like a kitten.
 

albator

New Member
Joined
January 14, 2020
Messages
49
Reaction score
3
City, State
Bonny Doon, CA
Year, Model & Trim Level
1999 Mercury Mountaineer
67k or 672k miles?

Yes for 5W-30, thanks.
 

drdoom

Well-Known Member
Joined
December 13, 2007
Messages
4,241
Reaction score
115
City, State
VA
Year, Model & Trim Level
2005 Eddie Bauer 4.6L 4X4
Motorcraft 05W/30 synthetic blend and filter.
 

koda2000

Explorer Addict
Joined
September 2, 2011
Messages
13,434
Reaction score
1,240
Year, Model & Trim Level
x
Oil - 5W30 (I use full synthetic because if synthetic blend is good, full synthetic is better)

Oil filter - Motorcraft is a good choice and WIX is slightly better. Stay away from cheap oil filters (like Fram, STP ect). If you want to spend more money on a filter Purolator Boss and Mobil 1 are really good filters (there are other good brands). If you don't know which size filter to use, some engines use a 3/4" SAE (Motorgraft FL1A) filter and some use a 22mm (Motorcraft FL820S) filter. They are not interchangeable.

I'd recommend using the best oil and filter you can afford. It's cheap insurance. I use Mobil 1 Extended Performance and Purolator Boss extended life oil filters on my V8's and I change my oil roughly once a year (6,000 - 7,000 miles or less). On my V6 I use regular 5W30 Mobil 1 full synthetic with a Motorcraft or Wix oil filter and I change the oil at (3,000 - 5000 miles) or twice a year.
 

UtahX

Well-Known Member
Joined
September 30, 2003
Messages
1,093
Reaction score
17
City, State
Grand Junction, Colorado
Year, Model & Trim Level
2000 Explorer XLT
Started using Mobil 1 full synthetic 5W-30 and Motorcraft FL-1A every 6,000 miles since I hit 100K around 2005.
 

MrQ

Smokey the Clutch is, Missed Shift You Did
Elite Explorer
Moderator Emeritus
Joined
October 5, 2008
Messages
2,886
Reaction score
266
Location
Humid, Damp, and Hot
City, State
Houston, TX
Year, Model & Trim Level
'98 EB, '93 Limited
Synthetic oil, Motorcraft filter. Period. End of sentence. Do not pass go, do not collect $200.
 

Mbrooks420

High Voltage.
Elite Explorer
EF Vendor
Joined
February 2, 2002
Messages
9,327
Reaction score
1,148
Year, Model & Trim Level
1998 Mountaineer AWD
Synthetic oil, any major brand. Top quality filter, Motorcraft/wix/mobile1. No high mileage oils, no wacky additives. I’d run the 5w30, but it probably wouldn’t matter if you used the 5w20.
 

albator

New Member
Joined
January 14, 2020
Messages
49
Reaction score
3
City, State
Bonny Doon, CA
Year, Model & Trim Level
1999 Mercury Mountaineer
I just ordered full synthetic 5W30, and the Motorcraft FL-1A filter. It will arrive next week (or 2 weeks?).

I bought both:
- mobil 1 High Mileage, it's on sale at Costco.com, $29 for 6 quarts
- kirkland full synthetic, $30 for 2 jugs, each 5 quarts, so 10 quarts total

I didn't know which one to chose. Both are full synthetic, 5w-30

I hope y'all doing well. I have been in lockdown for a few weeks because I'm helping a neighbor who is old, and I don't want her to catch the virus. So I'm extra cautious, and I kinda enjoy the solitude and calmness. I actually really enjoy not driving, staying home, cooking rice and beans, thinking, reading... and now I have time to take care of my truck!

Thanks a lot for your help and advice!
 

C420sailor

Active Member
Joined
July 29, 2008
Messages
309
Reaction score
35
City, State
Long Island, NY
Year, Model & Trim Level
98 XLT SOHC, 99 EB 5.0L
I run Shell Rotella T6 5W40 synthetic in everything I own (cars, trucks, bikes) except my airplane. Wet clutch compatible in the motorcycles. Been doing that for well over a decade. It is fantastic oil at a great price.

FL1A for the SOHC, FL820S for the 5.0
 

donalds

Elite Explorer
Joined
July 12, 2015
Messages
2,484
Reaction score
636
Location
Stem
City, State
Nc
Year, Model & Trim Level
1999 ford explorer sohc
Fl1a filter and m1 5-30 only
I change it at 3k seems early but this is a sohc so sooner is better
 

Mbrooks420

High Voltage.
Elite Explorer
EF Vendor
Joined
February 2, 2002
Messages
9,327
Reaction score
1,148
Year, Model & Trim Level
1998 Mountaineer AWD
I’d skip the high mileage. The last thing you want to do on that old SOHC is dislodge some sludge and plug up some oil passages in the motor.
 

albator

New Member
Joined
January 14, 2020
Messages
49
Reaction score
3
City, State
Bonny Doon, CA
Year, Model & Trim Level
1999 Mercury Mountaineer
Thanks for the advice. I will use the "normal" full synthetic from Costco.
I preferred it anyway because it comes in 5 quart jugs, not the 1 quart bottles. Less plastic waste.
And it's 40% cheaper. 10 quarts for the same price ($30) as 6 quarts. I love Costco!

I don't understand why most oil in the US is sold in 1 quart bottles?
It's such a waste of plastic packaging.

I’d skip the high mileage. The last thing you want to do on that old SOHC is dislodge some sludge and plug up some oil passages in the motor.
 

Mbrooks420

High Voltage.
Elite Explorer
EF Vendor
Joined
February 2, 2002
Messages
9,327
Reaction score
1,148
Year, Model & Trim Level
1998 Mountaineer AWD
Because a lot of people only add oil as they leak it and burn it out. A lot of cars now a days don’t take 5 quarts, as well.
 

masospaghetti

Elite Explorer
Joined
October 22, 2006
Messages
1,383
Reaction score
90
City, State
Huntington Beach, CA
Year, Model & Trim Level
98 XLT, OHV, 4D, 4x4, 5M
+1 for any major brand 5w-30 synthetic and the FL1A filter.

I've never noticed a real difference in any of the oils I've tried but there's obvious differences between filter brands. The Motorcraft filters are cheap enough there's no excuse to get a crappy filter.

I've tried regular and high mileage and haven't noticed any difference, including the oil drips on the garage floor.
 

albator

New Member
Joined
January 14, 2020
Messages
49
Reaction score
3
City, State
Bonny Doon, CA
Year, Model & Trim Level
1999 Mercury Mountaineer
How do I mark this thread as "solved"?
 

RickOTR

Active Member
Joined
January 4, 2000
Messages
920
Reaction score
40
Year, Model & Trim Level
97 Sport 4X4
Regular Mobil 1 Syn and FL-1A filter change at 3000 miles intervals
 

Jason94sport

Well-Known Member
Joined
April 30, 2001
Messages
4,106
Reaction score
43
City, State
South FL
Year, Model & Trim Level
02 Sport 2WD 5 speed
Motorcraft FL820S
Mobil 5W30 Synthetic.
Both are very cheap in Walmart
Every 6 months only cuase I don't drive it much.
 

donalds

Elite Explorer
Joined
July 12, 2015
Messages
2,484
Reaction score
636
Location
Stem
City, State
Nc
Year, Model & Trim Level
1999 ford explorer sohc
Join the Elite Explorers for $20.

Explorer Forum has probably saved you that much already, and will continue to save you money as you learn how to diagnose fix problems yourself and learn which modifications work without having to experiment on your own. Elite Explorer members see practically no advertisements, no banner ads, no double underlined links, can add their own profile photo, upload photo attachments in all forums, and Media Gallery, create and save more private Conversations, and more. Join Today. Your support is greatly appreciated.


koda2000

Explorer Addict
Joined
September 2, 2011
Messages
13,434
Reaction score
1,240
Year, Model & Trim Level
x
OP - You can only change the title if you go back and edit post #1 (your original post).
 

Top