Break-in Oil

[rw7810]

Allot of what I've read recommends using a straight 30 weight non-detergent oil for breaking in a new/rebuilt engine. Who even makes that anymore, were do you get it?? What have others used?

[fly944]

TRY NAPA

[garibaldi]

Castrol makes a straight weight oil that we use both during break in and normal operation beyond break in. It comes in 30, 40, 50, etc weights. I have gotten it from NAPA

[David]

Kendall

[red-beard]

I'm using Coastal 10W40, cause it's cheap and it is not staying in the engine long...Comes in 4 qt containers. I bought a case of 6 gallons for the inital breakin. Once that is over, I'm switching to synthetic.

[Wayne 962]

Originally posted by red-beard
I'm using Coastal 10W40, cause it's cheap and it is not staying in the engine long...Comes in 4 qt containers. I bought a case of 6 gallons for the inital breakin. Once that is over, I'm switching to synthetic.

That's exactly what I do - have had good luck with Castrol...

-Wayne

[Eagledriver]

Coastal/Castrol whatever it takes

[red-beard]

You Say Castrol
I say Coastal....

[Wayne 962]

Originally posted by red-beard
You Say Castrol
I say Coastal....

Hmm, I guess I should learn to read more clearly...



-Wayne

[mike f]

And what about castor oil?

[red-beard]

Actually, I decided to go green and used Olive Oil. Extra Vigin for my blond!

[Max911SC]

Can you use 20-50 (my regular weight oil) after a top end rebuild? If not, what is the reason?

[ChrisBennet]

I use Coastal 10W-30. Edit: Coastal 10W-30 is non-detergent.
-Chris

[Porsche_monkey]

My engine rebuilder recomended a slightly thinner oil for break-in of the rings, therefore 10W30 for break-in, then 15W40 later.

The thicker oil will probably work fine, but you want the rings to seat as quickly as possible, therefore the thinner oil is preferred.

I previously thought the straight 30 would be better, but at operating temps it is thicker than 10W30, so I have revised my opinion.

[afterburn 549]

we are talking the 1st 20 min right??

[Porsche_monkey]

My alusil 'expert' says for full ring break-in time, several hundred miles. I'm doing it now, oil pressure is not a problem.

[jgparker]

I do 1K miles on organic oil (any name brand). After that, synthetic 15W50. Synthetics are slick enough to prevent things from wearing in properly.

JP

[Porsche_monkey]

I agree. Unless it is factory recomended, do not try to break it in with synthetic. The rings might glaze rather than seat in the cylinders..