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Discussion Starter · #1 ·
just switched to the synthetic 5w40 rotella T6 from the conventional 15-w40 and what a difference it makes. Now that the weather is starting to cool down the 15w definitely increased crank time and the motor sounded awefull. Switching to 5w my truck is now "quarter turn to start" like normal and sounding nice and smooth. I really don't think the 15w is any good below 50F.

Don't like the price tag but I think I'm going to stick with the 5w year round. I'll keep and eye on the oil level and see if I can make up the difference by increasing the change duration.

How long are you guys running your 5w between changes? Only way to beak even here would be to do 6k/6 months. Is that too long? While I may not like the cost of synthetic, my motor seems to be loving it.
 
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