WALK NASTY984

wanting to switch to royal purple or german castrol just didnt know if 75,000 miles was to high to make the switch?

OSU Football Fan

iTrader: (23)

You're fine. Most people on here run synthetic oil
regardless of mileage. I run Penzoil Platinum.

BigBirdLS1

75,000 is perfectly fine to start running synthetic. In fact most car manufacturers recommend that you start using synthetic at 75000 miles. You will however possibly get some leaks because synthetic is "thinner" than conventional either way go for it.

WALK NASTY984

alright appreciate the feedback....been running regular pennzoil for the life of the motor and then i started reading some of the past post on the topic of oil...and noticed nobody runs pennzoil...so i figured there a bad reason why nobody runs that oil...but then again im a noob so i could just be full of it and have no idea what im talking about

RPM WS6

iTrader: (3)

Like said above, if you have any sort of leaks you may notice them get a bit worse with synthetic. That's the only thing I've ever seen happen when switching on a higher mileage motor. Otherwise, you will be fine.

98TAjwh

iTrader: (4)

you're good, i just switched to royal purple at 112,000.

BigRobSS

iTrader: (1)

I run Pennzoil Platinum with 79k on the clock, no problems or leaks.

Josh18Fan

iTrader: (2)

75,000 is fine. I've been using Pennzoil Platinum 5w-30 since I got the car. Let me tell you, I've never seen a cleaner bottom end and oil pan in my life.

SparkyJJO

iTrader: (11)

I switched when my motor had 84k on it.

TurdsOfMayhem

iTrader: (4)

You might notice a little more seapage(sp) than what your use to, but I'd say you will be perfectly fine. I run Castrol Syntech 5w-30, the owner before me (1st owner of car) ran it the whole time they had it too.

cpo

iTrader: (13)

Really? Please post a link to that claim. I'd love to read the scientific explanation behind that steamy pile of bs.

SOMbitch

iTrader: (8)

Better late than never.......

johnnybravo

I think he's refering that synthetic doesn't swell the seals as much as dino oil.

That's my guess. But, I'm no engineer, just an end product consumer.

SREETRACEGUY

iTrader: (13)

i started my camaro on it at 90K no issuse at all other than the weekend before the swap it ran 8.7s theweekend after it went 8.60 and had not ran a 8.6anything since it was at 35K

knightryda01

I run mobil 1 in the bird... Never had a problem.

I also run mobil 1 in my tahoe... 256,000 on the clock and leaks no oil.

FiredUpZ28

this


This is the truth about running syn in a higher mileage car. Period. Syn is not "thinner" it just cleans better, so if you have a leak its gonna clean the gunk outta the hole, making a leak worse. Thats the only problem. And who cares - Fix your leaks!

nighthawk15

Pretty much any time you want is fine for switching to a synthetic. And there are actually two reasons why it causes leaks to show up that don't with conventional. The first being that yes it does clean things out rather than putting sludge in them like conventional does. The second reason is (ironically) the same thing that makes synthetic oils lubricate a bit better than dino oils. Though syns are not truly "thinner", the molecules are smaller, thus making it squeeze through tight spaces easier.

justin455

penzoil platinum is one of the better synthetic oils out there. Don't get me wrong, you'll never find a "bad" one, but PP always ranks pretty high in used oil analysis. Combine that with being one of the cheaper ones and it's what I use.

bobistheoilguy.com

NastyNate65

This is a pretty good article. It explains that synthetic oil molecules are all uniform and small in size, as opposed to conventional oil that has small, medium, and large sized molecules. Hence, synthetic oil is "thinner" than conventional. And also cleans better, as someone else stated.

http://www.synthetic-motor-oil-chang...-to-synthetic/

Z28_LT1

iTrader: (2)

I don't even use oil...