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Greg Ondayko
PostPosted: Wed Nov 23, 2022 8:05 am 
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I spotted this available at the Local Wal*Mart.
I would have bought some, but they were out of the Grade I wanted, So I bought the Regular Castrol GTX. Price was the same for 5 qts of conventional or API SJ / Classic /High Zinc.

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Is the higher Zinc going to be beneficial for the Majority of Slant 6 engines?

I guess I am looking for substantial fact based evidence to confirm this is a better choice for the same price vs current other API ratings.

Trying not to start an opinion column about oils.

Greg

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Dart270
PostPosted: Wed Nov 23, 2022 11:04 am 
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Interesting. Can't hurt to have some extra insurance, but I think extra zinc is not needed except perhaps on cam break in, or with a high lift and fast rate-of-lift camshaft.

Lou

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Rick Covalt
PostPosted: Wed Nov 23, 2022 4:47 pm 
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Is it just a marketing gimmick? Do they tell us how much zinc it really has compared to the new and old versions? Just thinking out loud. But I too think more zinc is not going to hurt.

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Valleyant
PostPosted: Wed Nov 23, 2022 7:25 pm 
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Fact from Castrols MSDS
1400 PPM of zinc for this weight of oil and this specific "Classic high zinc" type.....
When I get time I will check how it compares to other weights etc....
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SlantSixDan
PostPosted: Wed Nov 23, 2022 9:21 pm 
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Facts help with questions like this one. Here is a really good start.

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ric325v63
PostPosted: Thu Nov 24, 2022 9:17 am 
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That was an excellent and illuminating read on oils. Thank you.
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Greg Ondayko
PostPosted: Fri Nov 25, 2022 2:23 pm 
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Thanks Dan. I will read up on the report and i am sure it will help me make a more informed decision when oil shopping.

Greg

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Not2slow
PostPosted: Tue Dec 27, 2022 12:16 pm 
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Facts help with questions like this one. Here is a really good start.
That is a VERY extensive article. I'm an engineer and it was a bit much for me, but good info. I'll print it off and hand it to the next person that asks "what oil do you run?" :D
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Greg Ondayko
PostPosted: Tue Dec 27, 2022 1:25 pm 
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Facts help with questions like this one. Here is a really good start.
That is a VERY extensive article. I'm an engineer and it was a bit much for me, but good info. I'll print it off and hand it to the next person that asks "what oil do you run?" :D

Yes thank you.

It is extensive.. I wi hafta re read it a few times as I am but on the slow side, but It helped to make a more informed decision.

Greg

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