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Clevy I believe only the 0w30 comes in signature series and yes I am using the 25,000 mile nanofiber amsoil filter.

Yeah the truck in my sig is what i'm speaking of and it has 43,000 plus miles now, this increase in milegae started last week when I went to synthetic, strange aint it...

Last summer my truck stayed around 13.3 to 13.8, i think the increased fuel mileage is from the change of oil not the weather.

Oh, btw the guys this is an awesome website!

Originally Posted By: CATERHAM First welcome to BITOG. As the saying goes you can't judge a book by it's cover and that applies to the SAE grade on a bottle of oil. Asmoil ASM 0W-20 with it's HTHS vis of 2.8cP makes it one of the heaviest 20wt oils you can buy, about 8% heavier at operating...

Thanks for answering my question about heavier weight oil, i often wondered that. Anyway, i am sticking to the 0w20 amsoil, i think its dang good oil. I am a little skeptical about going 25000 miles on the same oil and filter even under normal driving conditions, but we will see. I will be ding...

My truck has averaged 13.3 mpg with castrol. Just made the switch to amsoil 0w20 full synthetic at 43000 miles. I noticed my fuel mileage going up and its settled in 0n 15.0 mpg, don't know if its the warmer weather or the synthetic? I live in south ms and the summers are hot down here...