DRIVE2FAST

POST YOUR FAVORITE OIL TYPE HERE.

Aldudley5

castrol gtx 10w-40.
I guess nobody else uses oil

91 1LE

iTrader: (1)

I use Rotella 15W40 diesel oil for engine break-in and now I'm switching to 10W30 Mobil 1 full synthetic because it's cheap at Costco ($26 for a 6 pack).

drknow90rs_ss@y

iTrader: (3)

I also use rotella for break-in. It's really good at trapping particles and is meant to last 10,000 miles or more. (In diesel engines.) I also prefer mobil-1 synthetic's.

87Proud

Castrol conventional 20w 50 during summer (Car loves it) And 15W 40 during winter.

DRIVE2FAST

A LOT OF TGO'S SEEM TO PREFER MOBIL 1 SYNTHETIC. IM STARTING TO MYSELF. THE RECO AT UTI IS ROYAL PURPLE SYNTHETIC. PRICEY. WORTH IT??? IDK. ANY OPINIONS ????

ASE doc

I run Mobile 1 15W50 in my 355. It was clearanced for racing oil. (.0025 +/-.0001 on rods and mains)

DRIVE2FAST

THAT BEARING CLEARANCE LOOKS LIKE A HIGHER THAN NORMAL ( OEM) APPROX .0005 ON SOME ENGINES . DOES THE 15W50 HAVE A LARGER MOLECULE SIZE OR ARE ALL SYNTHETIC OIL MOLECULES PHYSICALLY SMALLER ? I ASSUME YOU ARE RUNNIG A HIGH VOLUME OIL PUMP. MY OIL PRESSURE IDLES AT 35 PSI WHEN HOT AND ON STARTUP RUNS AROUND 50-60 PSI WITH A HIGH VOLUME OIL PUMP.

ChainHartMachin

Mobil 1 10W-30 High Mileage. I chose the HM mainly because of the High Temp. High Shear (HTHS) number. I've read that a higher HTHS correlates to lower wear in real engines (everything else being equal).

91 1LE

iTrader: (1)

Royal Purple always does better in performance tests than Mobil 1. Don't know if it's worth the extra money, though. Synthetic oil molecules are a uniform size and remain so throughout its life. Conventional oil has a wide range of molecule sizes which leads to instability of the oil film.

92firebird 305

i use royal purple 5w30 and k&n oil filter

DRIVE2FAST

I SWITCHED TO MOBIL 1 SYNTHETIC.

ewskater92

Anyone running Brad Penn 10w 30 racing oil? Thats what I've got, and it's working just fine for me. Never ran anything else though, only had this engine running since the beginning of the summer.

UNCLE TOM

iTrader: (1)

asking what kind of oil one prefers is like asking what kind of underwear you prefer . ( i like fruit of the loom boxers ) anyway most major brands are good . myself i favor synthetics , i will not mention a brand as most have been mentioned . for daily use most any brand would be O.K. . now i just changed oil in my riding mower , i used advance auto oil . my neighbor asked why i was putting in junk oil . i asked him if he thought kragen , advance , o'reilley , wal-mart etc. had their own oil refineries ? do you think so ? inexpensive is not always cheap . read and understand the API/SAE specs on the back of the container . just some food for thought . good luck .

drknow90rs_ss@y

iTrader: (3)

LOL, good point! That, and it's a lawn mower! I would HOPE it blows up, so I dont have to finish mowing the lawn! Sometimes I amuse myself! HAHAHA!

Scootermunch

what do you AZ peeps like to run in the summer?

DRIVE2FAST

I RUN EXACTLY WHAT THE MFG OIL CAP SHOWS IN A MOBIL 1 SYNTHETIC WITH A MOBIL 1 OIL FILTER.