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Originally Posted By: Hootbro Originally Posted By: NoNothing ..... All the bores are standard, had the cylinder walls honed. New Sealed Power rings, new Clevite bearings in the cam, rods, and crank. New seals all around. New valves and valve seals. Oil pump is original. ...... Just...

Originally Posted By: Zaedock Mixing the Mobil 1 75W140 with a 80W90 conventional would have no adverse effects. Thank you for all the help! I'll just top off with 80-W90 conventional and call it a day

Originally Posted By: Zaedock I wouldn't dump (i.e. waste) the 75W140. Just top off with 80W90. I guess it's up to you if you want to stick with 80W90 only. There's no issue with topping 75-W140 Syn off with 80-W90 Conv? I'm fine with doing that. Saves re-cleaning and sealing the diff. That...

Originally Posted By: Zaedock Blue RTV is fine on your diff cover. Oh? I'm learning so much, and feel like an idiot for being able to rebuild an engine and barely know what to do elsewhere on the car. If I'm pulling the diff cover to dump the half bottle of 75-W140 in there anyway I think...

Originally Posted By: Ramblejam Originally Posted By: NoNothing Where did you see 80-w90? https://www.fcsdchemicalsandlubricants.com/main/quickref/axlelube.pdf Excellent I have opened one bottle, got half of it in the diff before I had to run last night. I'm also a complete idiot and...

Originally Posted By: JGmazda Break in your engine on any conventional 5w-30. Go for the full 5K. PYB would work fine. No reason to switch to synthetics until everything is mated and broken-in. Don't baby that engine... Seat those rings! I'm doing my next dump from initial startup and a quick...

75-W140 is what I had seen recommended online. I don't have the manual and have been relying on others for information. Where did you see 80-w90? I should probably change that if I got it wrong... (EDIT: I see in the manual calls for 80-W90, I was reading on fordrangerforum that ford now...

Why go conventional? I seem to see a lot of raving about full synthetic on the forums. When and why is it appropriate to use conventional? I'm fine using conventional, no big deal there, I just assumed (maybe due to marketing) that synthetic was better.

Another oil recommendation thread! I have a '99 Ford Ranger XLT with a 2.5L I4 with 195k miles on it. I blew a head gasket and damaged the head so I did a full rebuild of the engine. All the bores are standard, had the cylinder walls honed. New Sealed Power rings, new Clevite bearings in the...