Synthetic

[1991 sploder]

Lettuce know about the rear main seal between the engine and transmission also....

 

[Davies0202]

That's a separate issue ur going to have it come back with conventional.... I'm sure.. Since ur ALREADY a quart low why not add a stop leak product.. Changing it noe could make the problem worse...lucas oil makes a solid product but leaking valve covers.... Try and tighten them a little same with the pan... If they were leaking before they will leak again and there's nothing. Worse than a grease fire under the hood. You gotta remove the sludge...

I’m not to concerned with the sludge it’s been there for years and it’s just gonna come back but I’m going to avoid stop leak additives I’m pretty sure the motors fine I’m pretty sure a gasket just was obliterated and I’ve already tried to tighten them all I know I need new gaskets I just haven’t gotten around to it yet I’m gonna go check now for more leaks lol was gonna wait till morning so I don’t have to lay in snow but I can’t wait now lol

 

[Davies0202]

Lettuce know about the rear main seal between the engine and transmission also....

Yup that was leaking before the synthetic aswell. Edit: wait I’m an idiot the rear main seal doesn’t leak it’s relatively new (10 months) I just did it when I put a rebuilt trans in

 

[1991 sploder]

Oof on the new rear main u might want to stick with conventional not blend for the first few thousand miles... Reasoning behind that is they come from the factory with conventional during the break In period

 

[1991 sploder]

I wouldn't be concerned with the sludge either but if it does catch somehow... The sludge is fuel

 

[Davies0202]

Oof on the new rear main u might want to stick with conventional not blend for the first few thousand miles... Reasoning behind that is they come from the factory with conventional during the break In period

I’ve put 4,000 on it you think I’m safe?

 

[Davies0202]

I wouldn't be concerned with the sludge either but if it does catch somehow... The sludge is fuel

Yeah I have cleaned it but it comes back within a week or two so I just stopped bothering, I have a fire extinguisher in my car aswell for my car and never know what you’ll drive up on

 

[1991 sploder]

Hahaha yea my family is all like "why are you buying fire extinguishers all the time" lol they ALL GET used somehow ...4k is good but.your going to want to switch back to pure good old tasty conventional oil. Yea that rear main could be polished out and dripping too...BUT no problem just run it with the conventional... Maybe select the thicker oil example f it runnin that 5w20 ur gonna want to go with a recomended 10w30 for the time being it's thicker.. And what year is this truck? 5w20 was probably a change over from 10w30 in a tsb.

 

[Mbrooks420]

No need for conventional oil based on a new seal. I don’t understand the logic. Most cars now come with full synthetics. They aren’t any harder on seals.

 

[TechGuru]

All I know is when Castrol GTX changed from conventional to synthetic blend I started getting oil leaks.

 

[Davies0202]

Update: after Crawling under and look my guess that the oil pan gasket finally went was correct lol never thought I’d be excited to wake up to a massive puddle of oil haha. I’ll be switching the pan gasket and keeping synthetic in as it’s not burning it so I really have no reason to worry. Very glad it’s just a leak you can see in the front gasket material poking out so I’m assuming it was about to let go and the synthetic just sped it up a little. Also I’m sure the hard driving forced oil right out of that hole and amplified it. Now onto my next struggle of getting this oil pan out.. yay...

 

[spinnn]

Update: after Crawling under and look my guess that the oil pan gasket finally went was correct lol never thought I’d be excited to wake up to a massive puddle of oil haha. I’ll be switching the pan gasket and keeping synthetic in as it’s not burning it so I really have no reason to worry. Very glad it’s just a leak you can see in the front gasket material poking out so I’m assuming it was about to let go and the synthetic just sped it up a little. Also I’m sure the hard driving forced oil right out of that hole and amplified it. Now onto my next struggle of getting this oil pan out.. yay...

That sucks, and is cool all at the same time lol. Good luck with it. Do you have to yank the motor?
I have heard it said that the chains of molecules that make up the oil are shorter, or the molecules of oil are smaller, or some such thing related to an increased likelihood of leaking...my one truck with nearly 400k leaks a quart every 7500 miles or so (doesn't bother me), but my other two haven't leaked noticeably since I switched them over(105k & 190k). I do run slightly heavier oil than called for in those two...5w40...while the 400k one gets 15w-50 summer/5w-50 winter.

 

[Davies0202]

That sucks, and is cool all at the same time lol. Good luck with it. Do you have to yank the motor?
I have heard it said that the chains of molecules that make up the oil are shorter, or the molecules of oil are smaller, or some such thing related to an increased likelihood of leaking...my one truck with nearly 400k leaks a quart every 7500 miles or so (doesn't bother me), but my other two haven't leaked noticeably since I switched them over(105k & 190k). I do run slightly heavier oil than called for in those two...5w40...while the 400k one gets 15w-50 summer/5w-50 winter.

I honestly have no idea what I have to do but it from a quick glance it looks like the steering rack has to come down and maybe the front differential even. I also heard some people say they lift the engine up a few inches to do it? I’m not to excited does not look fun I’ll tell you that much lol

 

[Davies0202]

That sucks, and is cool all at the same time lol. Good luck with it. Do you have to yank the motor?
I have heard it said that the chains of molecules that make up the oil are shorter, or the molecules of oil are smaller, or some such thing related to an increased likelihood of leaking...my one truck with nearly 400k leaks a quart every 7500 miles or so (doesn't bother me), but my other two haven't leaked noticeably since I switched them over(105k & 190k). I do run slightly heavier oil than called for in those two...5w40...while the 400k one gets 15w-50 summer/5w-50 winter.

And yeah that’s good, It was my fault for switching it over I’m sure cause it did leak already I just figured instead of the 2-3 drops on the ground it would be 5-6 not the entire oil pan contents haha!