Help with oil type and weight selection

Joined
Dec 26, 2005
Messages
21,504
Location
Upper Midwest
for your car and climate 20w50 would be best but of course it needs to be changed more often because its conventional. I usually recommend 0w40 but not in your case as you state its not a daily drive, its would be more expensive and not necessarily better.
What 20W-50 has demonstrated performance through a demanding manufacturer approval like most 0W-40 oils?
 
Joined
Aug 5, 2021
Messages
114
Location
on the road in NE Oklahoma
In my customers cars, vintage and semi-vintage performance cars, both supercharged and NA, I use Mobil 1 0w-40 or Mobil 1 15w-50 depending on the climate and season. For your case I’d use the Mobil 1 0w-40 and change it as often is indicated based on the results of a Blackstone Lab report.

Both of those oils have excellent wear protection. In fact on my personal ‘66 supercharged Shelby GT-350 l have zero measurable wear after 88,000 miles.

I’m also using the 0w-40 in my daily driver, a 2002 Jaguar XKR (also factory supercharged). The Mobil products are so inexpensive I don’t see a legitimate reason for going with a conventional oil.

Z
 
Joined
May 21, 2018
Messages
2,879
Location
South Carolina
For your climate and usage 10w-40 changed every year (or two). Checking with the engine builder may, or may not, be a good idea. Some haven't a clue about oil and some are very well educated. Syn or Conv is your choice and probably has no benefit. Most Conv are a syn blend now.
 
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