Mystik JT8 15w50

[James408]

Hi, still experimenting with oils for my Pontiac 400. I just put some of this Mystik 15w50. It is the new synthetic blend which is still rated CI-4/SL. The 15w40 has gone to the new CJ-4. I contacted Citgo and they said it has 1300 ppm of zinc. Is this a good oil for a 10:1 400 with XE274 Comp Cam with 995 Valve Springs(heavy)?

 

[MolaKule]

The only way to know is to contact Terry Dyson and pull UOA's to see how the oils and engine combo are doing.

I suspect the Mobil 1, Redline, or Amsoil racing oils would fare better.

 

[LargeCarManX2]

I think it will be a fine oil for your engine. I was just looking today at 5 gallon pails with a 4 dollar rebate which brings it to 40 dollars for 5 gallons.....not bad.