Castrol Syntec 5W50

Joined
Apr 7, 2005
Messages
1,904
Location
Bay Area, CA
I used to use this oil in my 95 Montero. This 5W50 weight often was the only weight synthetic available in the parts store.(mid to late 90's) I wanted to use Synthetic for my new truck so I used this. After a while the other grades became more available (10W30). What is 5W50 for anyway? Why was it the only weight the store stocked?
 

pbm

Joined
Apr 19, 2004
Messages
9,030
Location
New York
I believe the original Syntec weight available in NA was 5w50. The same for QS Synquest and possibly Pennzoil Performax. I believe it was a "one size fits all" approach. Castrol eventually introduced a 10W30 because people wanted what their owners manual specified. I wouldn't worry about having used the 5w50. I'm pretty sure I read some good UOA's in an Audi using it. Do a search and see. Good Luck.
 
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