what is the best weight of motor oil to use in A EA-82 engine with about 135000 miles. i don't know a lot about these motors and i would like to make it last as long as possible.i would apprieciate any help given.

The manual should say anything from 10-30 to 10-40, and maybe a few higher and lower viscosity oils. I run 10W-30 Castrol GTX in all my subies and have had real good luck with them.

 

A lot of guys on the board will suggest running 20W-50 if you have lifter tick, but this is a double edged sword, it will quiet down your lifters, but it won't fix the problem, and it will increase wear on startup.

 

If your lifters are ticking its either a problem with the micky mouse gasket on the back of the oil pump, or your lifters are sticking, which can usually be fixed with a bottle of Marvel Mystery Oil near the end of an oil change, the last 500 miles or so, but don't over fill the oil.

I run 10w-30 in my Subaru with 265.000 miles with no lifter tick.

You're in NC? For an excellent 10w30 oil at a good price, you might try the Havoline 10w30, at a Fred's Discount Store near you. Buy it anywhere, for that matter, but in my area Fred's has the lowest regular price around on Havoline. The current SM formulation is an *excellent* conventional motor oil, & consistently produces *very* low engine wear on used oil analysis results over at http://www.bobistheoilguy.com. AKA BITOG, it's the best lubrication site on the 'net. Just as good, if you can find it, is the Chevron Supreme oil- virtually identical to Havoline these days. If that was my old Subaru, that's the oil I'd try first. Other good possibilities at bargain prices: Philips 66 Trop Artic, Kendall GT-1, Union 76, and MotorCraft are all produced by Conoco/Philips, & in same weights are virtually identical to each other. These days all the major brands are very good to excellent in SM formula- heck, even the WalMart SuperTech does well in most cars! And while I don't have specific experience with Subarus(other than a tune-up & oil change about 25 yrs ago), I do have a lot of experience with old cars & helping them to last as long as they can.