Is there any reason i shouldn't add this?
http://www.ebay.co.uk/itm/Joe-Gibbs-Dri ... SwDNdVgSMq
It's high zinc & posphate break in oil and i'm thinking of adding about 100 - 150ml to the normal oil (doing an oil change next week). I have a fully synthetic 5w30, Mobil Super 3000. I believe that the car is a roller cam, as it's an 87 tpi 305 and apparently 87 is when GM started rolling out rollers, though not all 87's were roller, some were still flat tappet.
I ask as most oils these days have low zinc and phosphate levels so that they don't affect the CAT. Mine's CAT-less, so i'm more interested in looking after the engine
Apparently the Mobile 3000 has 600ppm zinc and 500ppm phosphate, whereas it should really need (for a flat tappet) approx 1200ppm of each after break in. I've seen the more expensive Mobil1 Formula EPS (Emission Protection System) that is advertised as low phosphate, though the tech sheet says 800ppm zinc 900pm phosphate. Which is a little confusing - the emission protection version has more zinc and phosphate than the non-emission protection system
If i can add an additive then i'm happy. Real Steel suggest using a Valvoline Race oil after break in- 20w50 (a bit too high for my liking, engine spec is for 5w30) and they recommend adding about 150ml of the brake in oil at each change to keep the zddp levels up.
The bit that confused me is that break in oils like Joe Gibbs say they are only good for a few 100 miles, but then, if it's only being used as an additive, maybe that's not the case? Also not sure if it's ok to add non synthetic to synthetic?
Cheers!
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