In Reply to: Re: winter oil, summer oil...my mechanic's view posted by wildjoker on August 30, 1999 at 02:59:13:
: Has anybody else ever heard of this admonition to stay away from 10-40W?
: Thanks. Joker
YES - 10/40 is a wide range, you're asking 10W oil to performm at 4 times it's natural state. With 20-50, you're only asking the 20W base to perform at 2.5 times it's natural viscosity. 10/40 is not recommended by m/c makers either. Personally, Mobil1 15/50 Synthetic is my choice.