... 35 or 40 years old. I am puzzled by a comment in my (original) owner's manual which recommends against using multi-grade oils such as 10W-30 when the remperature increases above +32deg F. Is this a real concern?
... 35 or 40 years old. I am puzzled by a comment in my (original) owner's manual which recommends against using multi-grade oils such as 10W-30 when the remperature increases above +32deg F. Is this a real concern?