Gt40 what oil and filter are you using

[ricoshred]

Changing oil in 95 super sport GT 40 What filter and oil are you using ?? I think I've been using Framm PH8A and straight wait oil as the manual calls for. I'm thinking 10/40 oil would be better. What do you think?? What about the drive oil straight 30?

[Tryathlete]

I'm using Mobil 1 15/50. It has high sulphur
Content needed for flat tapper engines like the Ford 351. I also use the Mobil 1 oil filter. I have seen the benefits of synthetic oils in engine life cycle testing on light aircraft engine trials and the difference is dramatic and profound compared to conventional oils.


Sooner or later your toys own you

[a0128]

I use Valvoline Racing 20W-50 and a Fram XG8A Ultra filter. Just make sure the oil has a ZDDP content higher than 1400. Given we change the oil every 50 hours I don't see the benefit of synthetic oil.

[ricoshred]

Thanks much appreciated

[Jonny Quest]

Royal Purple HPS 20W-50. K&N Oil Filter HP-3001

[NCH2oSki]

With my previous boats I used Valvoline VR1 40wt, and a motorcraft FL1A

[east tx skier]

Valvoline VR1 20W50 and FL1A.

[JBird97Nautique]

Per PCM and a recent advisory I would not run anything above 40w as the bearing clearances weren't designed for that thick of an oil. Those that recommend 50w haven't lost their engine....yet.

[jkallen21]

That’s very interesting. I had constant issues in my 06 SANTE with the oil alarm sounding when decelerating (ZR6). I called PCM and the guy immediately recommended 50W oil. I did that for several seasons with no further issues. This is good info though.

[NautiqueTim]

I use Mobil 1 5w30 and I add some Lucus Oil zinc additive. FL1A or Napa Gold filter.

[Conwayfl]

https://www.knfilters.com/hm-3001-marine-oil-filter

If anyone is needing oil filters this seems like a decent deal I ordered a few free shipping over 25$

[hal2814]

On my GT40 I ran Delo 400 SDE and an FL1A filter. That oil meets the most recent specs. Kirklands 15w40 does too but I didn’t find that until after I sold that boat.

[Jonny Quest]

There are a lot of PCM small block Ford engines running with 10W-40, 5W-40, 20W-50, 15W50, 40W, etc. I don't know of any failures due to oil lubricity or viscosity issues as long as the ZDDP content is adequate. Too many folks get all wound-up around the axle when it comes to oil brand and viscosity. Relax. Run the boat.

JQ

[SAN4Fun]

I recently changed the oil in my 2001 GT40 and used sraight 40 weight VR1 racing oil. I looked back at the service records and noticed that the dealership that changed it last year used a 15 W 40 Rotella t4. Just for consistency, I think I'm going to change it and go back to the 15 w40. Is this the correct one and does it have enough zddp content? Is change it again worth the effort?

[Scooter G]

Seems a fair price for a K&N filter Conwayfl, and looks like they are still running at the sale price.
I run K&N's on all the 2 & 4 wheel toys, never thought about the boat. Thanks for the share.