Guest Stephenmilner Posted August 4, 2015 Share Posted August 4, 2015 Hi guysI have just put my rebuild head back on and all runs sweet.The next question I have is the grade of oil to use.I use penrite shelsley oil medium grade which is for vehicles that take a 40 sae oil.Should I use the shelsley heavy oil for vehicles using a 50 sae as I feel a 40 oil is a bit thin for an older engine? Any thoughts?Cheers everyoneSteve Link to comment Share on other sites More sharing options...
26-25Buick Posted August 4, 2015 Share Posted August 4, 2015 Hi Steve,We swapped over to the Penrite Shelsley Heavy last year in our '26 and it quieten down the valve train considerably so it obviously made a difference for us but our head hasn't been rebuilt since 1969 so it may not be a fair comparison to your newly rebuilt head. We chose the Heavy because our owners manual for the std 6 says use 50 sae. Link to comment Share on other sites More sharing options...
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