Driven Break In Oil 10w40
- Thread starter PontiacHO
- Start date
Should be loaded with 2800-3000 PPM ZDDP already (BR40), shouldn’t need any more, as long as you follow the cam builder’s instructions.
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Driven BR has been my go to for break-in oil for many years. As stated, do NOT add a supplement to it. There's no possible benefit that could be had adding a supplement (of any kind) to that oil. In fact, forget supplements even exist. If you need a supplement, you're using the wrong oil.
Thanks. I’ll carry on….
Yeah use break in oil with no other additive.
I've only ever used GMs break in oil additive plus regular oil.
Last time I fired up a new rebuild was a Honda gx390, I just used mobil1 v-twin 20w-50 oil with no additive. If I wipe a cam lobe it's because I definitely have a bad cam. Probably need to check on that engine make sure the lifters are wearing correctly.
It's less critical with small engines like that as they don't experience as much valvetrain load. Smaller valves means less surface area to cylinder pressure thus less force needed to overcome said pressure to open the valves. Smaller rocker ratios means less leverage of valve and spring pressure multiplied to the lifter side. Shorter pushrods, valves, and lifters have less inertia, and so on. I measured out a rather radical Predator 420 build that still had less load at the lobe/lifter interface than a bone stock 454 BBC.
Yeah they run like 30-40lb springs and 1:1 rocker ratio virtually all the time.
But mine could have a bad cam.
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