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Will the heavier weight have any negative consequences with higher RPMs? I looked on the M1 website and I can't seem to find info on M1 T&SUV is it exactly the same as Delvac? I am sending off a couple of oil analysis to Blackstone on monday, that'll give me a base.

I feel 5W may be strained as it's rarely below 30 degrees here and frequently 95+ in the summer.

just thought I'd update this. I spoke with a guy about their warranty and although he said 'no offroad damage' there is clearly wiggle room available because he said if you hit and object in the street, they'll repair/replace the tire.... isn't a trail just a primitive road?

Before I get trampled by Recco's for other brands of synthetics that may or may not be better (I don't want to debate that), I want to stay with Mobil 1 because it's more readily available locally... My '02 Jeep Wrangler has a 4.0 engine and 3 speed RH32 transmission. This combine with 4.56...

I'm no tree hugger else I'd drive something that gets better than 15 mpg, just curious mostly.

By using synthetic, am I decreasing use of crude oil? I don't know what exactly to search for in reguards to my answer, so forgive me if this is a repost.

those results tell me that he should have used something else. 200k is fairly typical with 0 internal work on that engine

I do realize that. I changed the factory fill @ 1k with mobil1 and a regular size M1 filter and again @ 3k with a regular M1 then it's been every 3k since then with an M1-301

just wanted to add that I am looking to go long changes 10k+ if possible. It get's 95+ here in the summer but rarely drops below 30 in the winter. Other possibly pertinent info; The Jeep sees a lot of off roading and has a 3 Speed auto tranny, so it runs 3000 RPMs at 70mph when on the freeway...

Hi all. I love the site, it's extremely informative but maybe a little bit too much for me. I feel a bit overwhelmed with all the abbreviations and I still don't understand the differences between 5w-30 & 15w-40 and how to know which is which... anyway, I changed my oil in my 02 TJ back in '03...

where do you put these magnets?

I searched and there are hundreds of threads talking about it but I don't really understand what it is and why it's important? Confused -Matt

I am in need of another set of 35" MTs, probably gonna go with BFGs.... Has anyone ever torn or cut a tire offroad and then tried to have Costco replace it?