Synthetic oil ?

[Suprapots99]

Is there any objections other than cost to using a full synthetic?

[wotan2525]

What year boat and what size engine?

[KarolinaKid]

Is there any objections other than cost to using a full synthetic?

I've run full synthetic in the engine and tranny for years.

[supraaddict]

I was wondering about this also. I have heard Royal Purple is good to use in the 5.7L.

[autobahnracing]

I have been running Amsoil for many years in my pcm 350, not a single problem or complaint.

[michael hunter]

I have run Mobil 1 15w50 in my 89 since break in has 770 hours now no problems.

[docdrs]

Your not supposed to use synthetic till after 100 hours. fwiw

[autobahnracing]

Your not supposed to use synthetic till after 100 hours. fwiw

+100

Put it in a new race engine once and never did get the rings to seat.

[TitanTn]

I used synthetic on almost everything I own. I struggle on the decision to put it in the boat though, because I change it every season and the amount of use is so low. It seems like a waste to run synthetic for 5 months and only every other weekend.

But no, I don't think there are any objections. After the recommended break-in, you're not going to hurt anything. I just wonder if you get any benefit out of it.

[michael hunter]

I remember the 35 hour years when I lived up north . Here in Georgia the season is so long and I am so close to the lake I average 250-300 hours a year. That's 5-6 oil changes a year. Even at that I still use the synthetic I feel the extra protection is worth the extra cost. Note the older flat lifter engines require ZDDP additive . Mobile 1 15w50 has the additives for older engines some of their other weights do not.