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Who is running their synthetics? I can get it from my buddy for about $5.50 a quart for their 0W-30 full synthetic. Supposedly it is a Group 4 base stock. - Not sure which manufacturers are using Group 4 or who is using Group 5? I trust him but I am so used to using AMSoil and have had such...

What are optimum oil temps for a 0w-40 full synthetic. I didn't beat on this truck that hard at all and I was seeing temps just north of 250 pretty easy. Just cruising it stays near the 230-250 mark and we have pretty cool temps right now. Thanks.

Wow. What a forum!! The information is crazy and voluminous. Thanks for all the great information so far. If you were going to choose one oil manufacturer to deal with for all your needs, who would it be? Figure your vehicles to consist of Diesel truck, Harley, Light duty trucks, Kia...