Best Oils
 

I was wondering what type of oils is everyone using in there high performance engines and out drives.
Also is there any advantage on running an aluminum flywheel on a 502HP?
Thanks in advance,
Mike

Engine oil=Mobil 1 15/50wt synthetic

Drive lube= Merc Hp Gear Lube

ulx110 20w50 merc in the drives

Engines - Penzoil 20/50

Drives - Merc hp gear lube

BTW,Why don't we use single grade motor oil,
since we don't use our boats at winter time?

Aluminium flywheels are for dragracing,
when you need that rapid throttle response.

Don't use it on boats unless it is a top fuel dragboat.

I have been running Valvoline Racing 40w but thinking about the Mobil 1......in the drives I use Amsoil ....Fred

Tried an Aluminum flywheel on a smallblock pushing an 18'. Had to bring the rev's up to shift into gear. Pulled the engine and put the heavy flywheel back on the next week. You need the centrifugul force to keep the motor from dying when you put it into gear.

I use the Merc 20w50 motor oil and the Merc HP gearlube for drives. Stock 502's.

The outdrive presently has redline shockproof/heavy oil in it.
The engine is running a straight 50w Mobil.
I was debating on changing the engine over to Purple ?

As for the aluminum flywheel that is what I thought. I was seeing if any one tried it.
Mike

Rotella T 15w40 in the engines and Merc HP lube in the drives

we use purple products in everything!

I suggest running 10-40 w oil... . Remember... multi viscosity oil stays the same thickness whether hot or cold... but the thinner the oil.. the better the flow... it doesn't matter how much pressure you have... if the oil isn't flowing.. you aren't lubricating... thinner oil passes through the filter easier with much less going around the filter through the bypass. Thinner oil also cools the engine better... the oil flows out past the edges of the rod bearings and flings up to the undersides of the pistons.. where it removes some of the heat from the piston... if the oil is thick.. it isn't flowing as much and removing the heat from the pistons. Hence.. more wear... more chance of detonation.. etc etc. Also ... thinner oil pumps better up the push rods and flows more oil over the valve springs to remove heat there.

Audacity,
How do you like the purple and how long have you been running it? What weight are you using in the engine?
FYI, I purchased my boat from Rick which purchased your boat.

we have been using the purple products from about 95ish on in the drives w/o question.

straight-grade or 41/51 depending on the engine application.

the 75/90 can be used in 95% of drive aps.

RoyalPurple in my 250 PowerStroke,Hp500efi,XZ drive & race car.Great stuff!BOB

Audacity,
Why do you say that the purple can be used in 95% of the drive units why not all?
I'm running a Bravo 1.

"the 75/90" in 95% of all drive applications...they manufacture MANY products to cover all your needs.

Troutly,

I've been using Amsoil 15W-40 for some time now. At my next change, I'm going to switch to Amsoil Series 2000 20W-50 Severe Service Racing Oil. I think it's a little bit better (definitely more expensive at $8 vs $5 per qt), but it may be overkill.

I'm also using Amsoil Series 2000 75W-90 in the Bravo. It works great. Shifts much better than the Merc stuff.

358 sbc 375hp using 15-50 Mobil 1

Alpha 1 with Simrek drive shower using Redline Shockproof heavy

BH

Amsoil Marine and diesel in the engine and the PSD F350. Amsoil 2000 in the Bravo.
I put the amsoil in at the begining of the season last year. 1 drive had to be pulled to put a new shift cable on. The service center changed the oil to Merc hp. Later in the summer the clutch cones welded up in the drive with the Merc oil in it. I wonder if it would've happened if it had the Amsoil in it??? The other drive was perfect all summer.

Rick here is the thread on oil
 

Here is the thread on the oil which I was talking about.

Why do people run multi grade oil in boat applications???

Biggest reason is probably that many of us run synthetics. To my knowledge, only Royal Purple offers a straight-weight DETERGENT synthetic oil. (Redline has a non-detergent straight-weight that is strictly for racing.)

Mobil 1 15w-50 Whipple Charged 502

Merc HP Drive Oil

Mobil 1 15-50 procharged 502s

Merc lube in the drives. Drained the lube this winter and found oil to be clean, except for powdery residue, and the same on the magnets. I will stick with Merc stuff.

I have Valvoline racing 40 in it now.

Come this weekend I'll be putting Mobile 1 15w-50 synthetic. Debated this for a long time but after reading on here about the results w/synthetics, decided to go with it.

Merc HP lube in the drives as well.