Again, while this particular instance could be construed (in my case) to a Sunwest 2.5L SOHC EJ251 "Enhanced short block"
https://sunwestautoinc.com/product/subaru-ej25-short-block-2-5l-sohc-1999-2005/ mated to some Subaru Reconditioned Non-EGR heads that should be for it, and with Six Star Revised MLS gaskets for the mating of...
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And of course, all new timing belt kit and other gaskets ready to go... - I have not yet viewed the information Sunwest has sent over about "how best to break it in." I thought I'd ask here.
@Trav has given me a great lead on two 10W-40 mineral and high zinc break-in oils to run.. however, I still have questions (and again, if this is for "all engines" cool, please specify in your reply
1. How long to run break-in oil for?
(Preliminary research seems to suggest 100 to 200 miles "should be okay," yay or nay?)
2.
How to drive during break in? Everything I have heard says to me moderate/hard on the throttle and do a lot of letting the engine coast down to speed, keeping an eye on temperature or maybe short runs (again, how long? Speeds? Highway, like an hour blast varying it like 65 to 90 for short times one way then letting it sit, or two hours of same, moderate to high RPMs.. how???? Highway cruising speed can easily be about 80 and a little faster than that sometimes. Would that be a good environment? Or not maintain same speed...)
3. Engine break-in oils help specifically with optimal ring sealing for highest compression, moreso than a regular "non synthetic" oil which this board has essentially taught me doesn't quite exist? Group 1, 2, 3, 4, 5 or Roman numerals thereof, every other thread seems to touch on this......
4. See questions 3, it's worth it to buy that oil and run it for.. ~200 miles, or how long, see question 1?
5. Any engine break-in oil that isn't a 10W-40?
6. Is it OK to use an xW-30 (like, more than likely, HPL No VII 5W-30) after using break in oil? I'll have the Fumoto valve on...
7. When is the engine broken in, when can normal oil be used?
@Trav recommended me one of these two: (so I'm inclined to purchase one of these two. I have a new catalytic converter ready to go, as well, since the old one has been flooded with coolant
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Free Shipping - Driven Racing Oil BR40 Conventional Break-In Motor Oil with qualifying orders of $109. Shop Engine Oil at Summit Racing.
www.summitracing.com