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I wanted to update everyone on the last two oil analysis samples… the one with lower zinc is where I put the additive… they highlighted the viscosity because they thought it was a 30W not a 40W… the more recent sample is when I switched over to amsoil heavy duty diesel 15W-40 full synthetic and...

The liqui molly 85W-90 mineral oil has viscosity of 194 at 40C and the amsoil 75W-110 has 139.9. Since I live in a hot climate (florida)... will this be an issue? of course the 100C is 17.5 vs 20.9 maybe this means the 85w will protect better while the car is warming up? But then mineral oil...

yeah. and i love your quote lol!

Thank you for the advice. Yes I love this car and it’s a shame you lost it in the divorce. That’s why they recommend pre and post nuptial agreements LOL. I did look into a 300SD early 2020 before the virus, 145k miles and only $3k was in very good condition. I always preferred the gassers but...

Yes. All that work plus so much more was done in 2020. That’s very good advice though because most people who own these cars don’t know that needs replacing until the engine blows up. The mechanic said nothing about zinc he only said “not to use 0w or 5W oils” I’m not saying he is right just...

Thank you very much, I appreciate your advice!

I found some more technical data but between amsoil's max duty and their heavy duty. It seems the max duty has 4.5 HTHS and 5.1 NOACK vs heavy duty which is 4.7 HTHS and 3.6 NOACK. Why does the more expensive oil have (worse?) numbers? heavy duty is only $6 more than rotella and probably a lot...

absolutely nothing. on the zinc question i learned that from this forum. I think I just wrote that sentence badly lol

Appreciate it. now deciding between amsoil 75w-110 and the liqui molly. do you think the amsoil will be more superior due to being synthetic also? the amsoil has 20.9cst at 100C. i drove 8 hours at 85mph with my exitsting 75w-90 M1. hope no extra wear happened

Thank you. I wonder if the liqui Molly 85W-90 is a “thicker” 90.

I’m not saying you are wrong but I asked two specialist mechanic and they said not to go different from the Manual. Zinc content based on flat tappets.

Thanks. So it’s true the new 90 weights may be thinner for my car. So ideally I should go with a 110 weight? I actually put a 75W-90 M1 a while ago but after reading about how thin it is it got me worried.

Thanks. Yeah 4.7 is a deadline 40wt pretty much lol.

Hello, I know this has been discussed but I cannot get a clear answer. My 1988 Mercedes 420SEL calls for either SAE 90 or 85W90 for the differential. Not limited slip. Can only find 85W90 from liqui molly but it is dino. Closest to this weight I found is amsoil 80W90 synthetic. I live in...

I think it was reduced or I may be wrong. I know m1 fs has enough zinc though, jut not cold enough to use it. Btw one oil change without filter for my car with t6 is $50. Amsoil will be 80+…..

T6 is 24 I think but I need zinc and it has 1050ppm of it. If Castrol had zinc I would go for it

Nothing. I baby it lol. Just want maximum wear protection. Probably wasting money with amsoil? Car rated up to 7500mi OCI in 1988 prob with conventional.

Because I was recommended 0w and 5W by others here but they had lower than 3.9HTHS. I assume higher is better? And I just refuse to put that oil in my car in my climate…. I would happily use it if I lived up north instead. Redline 15-40 is 4.7 which is Pretty much 50wt but my thing isn’t a race...

Hello, I have a 1988 Mercedes 420sel and it seems that I can use 10W-40, 15W-40, or 20W-50. Considering going with 15W-40 but only diesel options and the two I’m considering are in the title. I know little of oils compared to most on this site and am curious what the experts think. Could not...