Lost comp. on cyl. #4

[HawaiiGuy]

Okay, so run in oil should be changed.

[Robert_6]

I was thinking of changing it at the 500 mile re-torque and valve clearance adjustment. Should I change it sooner?

[HawaiiGuy]

Never hurts. Especially if you were not able to perform the flat tappet/cam, run in procedure(initial startup speed kept above 1000, varying engine speed for 20 minutes). Modern engines do come from the factory with an initial break in service oil in the pan, Ford, Acura, and a few others. Up to you, but I would. Go with an oil that has additives in it for flat tappet engine.(I found Yamalube, for less than 4 bucks a quart, but that was a few years back, and it had all the additives in it).

[Robert_6]

So I should use an oil additive to help break-in the new tappets? I went to the Yamalube site and there are all different types.
Thanks

[HawaiiGuy]

I used the all purpose 10-40 for motorcycles, etc. I see on the site black container, 5.99 a bottle.(now) :whistle:

[Robert_6]

OK, thanks.