Hey Curley!

I'm afraid I cannot be much help. Over the past 5 years I have gone totally to AmsOil products and am extremely happy with them. I use AmsOil full Synthetics in my Porsche 911 and 91 300D, but of course, I still see people who use all kinds of oils. BTW, recent oil tests on all my vehicles and the tests came back extremely clean. I was thrilled with the reports ;-)

The oil business is always playing with their formulas and I cannot keep up with them. Sorry - I know nothing about Castrol's Synthetic and can't help there either.

Valvoline makes a great product but if you want to try something different I recommend Amsoil - I can sell it to you or you can get an inexpensive "dealership" which cuts your cost dramatically. Shipping is very reasonable as well. I am very happy with it - it holds up well and does not seem to drop viscosity when the engine gets up to full temp.

Here's some info on the Amsoil Base Stocks:


I don't like to appear to be advertising on this forum so I will reply privately to future comments. I can help with pricing as well.

Have a great day!

On 9/18/2016 9:23 PM, Curley McLain wrote:

do you have any info or insight on how the valvoline full synthretic compares to M1? I am curious if the base stocks are similar, and if the performance is similar. I think I will use the Valvoline in the Merkun engines, but after the bad experience with castrol so-called synthetic, I am not sure I want to try it in an OM603. My 616s get so few miles that I leave them on Mobil Dino oil.

uhOh!  Nuther oel thread....


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