[Mobbdeeptwisted]

I can't decide on a oil to use in my 2.3L, I Saw Royal Purple but someone told me that it would eventually make my seals get soft and leak. I was also wondering about Valvoline High Mileage Motor Oil(Non Synthetic) Thanks.

[74stang2togo]

Muscle Mustangs and Fast Fords magazine did an article on common motor oil myths and the whole "seals and gaskets leaking from switching to synthetic" was one of them.

As far as oil for a 2.3 goes, 10w30 is recommended, and 10w40 is the highest you can safely go with a stock engine, anything higher and you risk shearing the gear off of the distributor because of the tight tolerances of the engine.

Valvoline Max Life (their high mileage motor oil) is a good product, I've been using their oil in my '75 Chevy for nearly six years now, the engine is just as clean inside as the day I went through and scraped out all the sludge buildup from the infrequent oil changes the engine I put in her had recieved. My '75 Thunderbird and my '74 Mustang also used this oil when I was driving them, and it's going into my '76 Mustang first thing tomorrow morning when I change the oil and tune it up.

In all honesty, any good name-brand motor oil that meets ILSAC GF3 or GF4 is a good oil to use, just look on the back of the bottle to see if the oil you're looking at is ILSAC recommended, Castrol, Mobil, and Valvoline tend to meet or exceed their expectations.

(If you're wondering what "ILSAC" is, there is a description here: ILSAC, JASO and GF Oils It also includes advertising for "Amsoil" which is pretty good but pretty expensive stuff, but it's the best definition I could find).

[sleeper_inc]

I run 10W-30 in summer and 5W-30 in winter (-50*C sometimes)

I use castrol sludge protection or what ever its called. Works good.

[Aimbot1]

10w-30 Valvoline (fav oil i use in all my cars)
but yeah 5w-30 in winter

the high milage is just a joke IMO


go get ya a K&N oil filter and some 10w-30 as long as its not synthetic

[Mobbdeeptwisted]

Thanks guys! Ill Be using 5w30 Valvoline

[rgf350915]

i use mobil 1 10W30 synthetic with a fram synthetic filter. when i switched to synthetic 2 years ago there was a modest improvement in oil pressure. i change it every 6 months which is about 6,000 miles. there is 150,000 miles on the engine; it uses a litre (us qt) of oil every 3,000 miles.

[b_chandler]

My '91 gets 10w-30 Valvoline and a Motorcraft Wix,or at the very least, Purolator filter every oil change. Typically between 4 and 5000 miles. I think 3000 miles is ridiculous unless you're driving across open desert every day.

My '01 Ram was getting Amsoil 5w-30 until my Amsoil supplier went belly up. Now it gets the same in a Mobil 1 Oil is changed in 10K mile intervals. Wix filters exclusively. I've used Purolator in a pinch.

No oil related issues, great oil pressure, and NO sludge.

[74stang2togo]

Originally Posted by Aimbot1

the high milage is just a joke IMO

I just use it because it has more detergents in it and I'm dealing with 30+ year old engines in the cars/trucks I run it in, the cleaner the insides of those are, the happier I am! It also does slow oil burn off, my old Thunderbird was slowly burning about a half quart between oil changes using regular Valvoline 20w50, switching to the MaxLife slowed it to the point I couldn't tell the difference on the dipstick anymore.

Whole reason I tried it was because I got a free case of it through work when it first came out... figured it couldn't hurt.

[stoneweiser]

i have a 93 with 58,000 its only had penzoil 10w30 never a prob yet!

[J. Rhapsody]

Im planing on using royal purple, but im gonna flush it out with like quaker state or somim