Technical & General Discussion Area > Tech Torque Pre 1973
oils
scott:
is it ok to use gtx 2 in my 1970 coupe ive used it in allmy other old fords but ive heard a that you need to be careful with u r oils cause of the valve set ups in these old engines;w
fangstang:
a 15w or 20w oil will do fine
66FBK:
--- Quote from: fangstang link=topic=10841.msg112566#msg112566 ---a 15w or 20w oil will do fine
--- End quote ---
do you mean 20/ 50w oil as 15-20w is a thin oil. i wouldn't use it in my sewing machine. I have be using Castrol Edge Sport 30-50W . It is made for big bore motors and suits well, especially in hot conditions or in traffic the oil pressure stays high.
fangstang:
no i mean 15w40 or 20w40 oil its not a thin oil, thin oil is 5w or 10w,15w40 is also a common oil used for most diesel engines (how big is this sewing machine?)
66RedRagtop:
Go the Castrol Edge Sport 25W-50, or Penrite HPR40, as both have the required zddp (phosporous/zinc) content to protect our flat tappet engines.
Friends race historic cars on these two oils with no measurable wear after a season.
Strange but Penrite HPR30 is less suitable, being an oil with less zddp content for modern engines.
Running the oil warmer (85C min) rather than cooler gives the best wear protection.
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