What oil do you use?

[Paulywood]

I just got done winterizing the boat and was curious what oil other people use. I decided on Mobil 1 synthetic. I used to use the Mercruiser oil but decided to spend my money on a better synthetic. So what do you use?

[1mainiac]

I stick with conventional oils well racing blends of them Castrol 20w 50 racing or Valvoline 20w 50 racing oil. I have been running those 2 oils for close to 40 year in V8 engines and never had a oil related failure. It keeps good oil psi when hot and is designed to be abused.

Edited November 1, 2009 by 1 MAINIAC
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[anthonyyost]

I think that the Mercury oil does just fine, changing the oil and filter on a regular basis is probably more important than whether you use mineral or synthetic oil.

[tangled mess]

I use valvoline strait 30 weight and i change my oil every 50 to 60 hours oil changes are cheep insurance.

[Priority1]

Regular changes are the key. I change mine when it starts to darken. Mine gets changed two or three times a year. Trolling is tough on oil.

[Boltman]

I use Mercruiser oil in the Twins, thinking of going synthetic from AMS oil, I carry it at my shop, I've used it in my truck ever since I've had it... 450,000 miles later... it still hauls th boat..

[MY2SONS]

Not quite sure why but my owners manual says not to use full synthetic oils in my engine. It's a 6.2L Mercruiser engine. I run full synthetic in my trucks (Mobil 1), but they recommend Mercruiser brand oil. (I know, I know, they're always going to say there oil is the best, but WTH).

[Paulywood]

I know guys that run the Ams oil in Mercruisers, they swear by it. That's why I decided to try synthetic. I'm going to see if it holds up better to the trolling than the Mercruiser oil.

[Fishwhisperer]

Would you get longer life out of a full synthetic, allowing for more hours between changes?

[Paulywood]

I'm not sure Randy. I'm going to monitor the condition of the oil next summer and log the hours. We'll see what happens.

[Fishwhisperer]

The reason I ask is that with the extra cost of full synthetic, you get 10K in an auto and can can extend it to 15K with all highway miles.

[Priority1]

I tried full synthetic last year. It got dirty just as fast as regular oil. Trolling is a lot tougher on oils than cruising. When the oil starts to darken, change it. Mine gets changed 2 or 3 times a year. I do a lot of slow trolling. I like Castrol.

[silver one]

Mobil 1, 10w30. Looks new every year when i change it. Just a note. Alot of guys will change oil based on number of hours of runtime on engine. When your boat sits 5 to 6 months out of a year that oil still breaks down just sitting. Change it every season or more reguardless of runtime.