Robertjr

Have been using Amsoil 20w-50 Series2000 for the last several years with excellent results. No oil analyisis,have had bearings out each year,look good. The above oil is no longer available, which should I go to: Amsoil Motorcycle 20w-50(MCV), Amsoil Motoroil 20w-50(ARO) or Amsoil Dominator15w-50(RD50)? HP500, now is 515cu Brodix heads etc. I run it hard, 20-25 hour oil changes. So what is it gonna be? Great thread by the way, beats working! to busy reading important stuff to go to meetings! robertjr

cloudmaster_321

what's the latest and greatest on the 15-50 Mobil 1. I ran this in my engine before the rebuild, and the latest builder didn't think to highly of Mobil. I run it in both my vehicles and have no complaints. Is the Amsoil gonna be better than the silver cap or whatever the latest production is?

Rage

I hear 20 - 25 hour change interval a lot espically for the bigger HP motors. Is that seemingly short change interval mostly because of higher fuel contamination/dilution of the oil from such engines being tuned to run rich or because the oil temperature runs a lot lot hotter than 220-230F or because the oil temperature run a lot cooler than 212F or?

Robertjr

It's a schedule that I've kept for several years, ring end gaps are set up a little on the loose side,18-20 thousndths on the top ring I believe,bottom ring I couldn't tell youright now. Data is at the shop I run out of, aways from here so I may not be accurate.Get a little contamination on warm up! But when warm will run wide open for ever or till something beaks!!!! But what the hey! I'm a sick puppy!!!! usually at the end of summer anyway. But lasts a summer or two! I pull it down every year anyway! Jetted pretty close, choc brown plugs More reliability in the drive dpartment since using Severe gear 75w-90 So any opionions on the oil I asked about?

minxguy

Personally I think it is number that has been picked as a safe number, perhaps it's a number that most boaters boat a year. I really don't know.

The auto industry was always a 3K oil change, now up to 15K according to oil monitoring programs in cars. The manufacture can't say a thing as they are the ones who built the software for the computer.


I would use oil analysis to make a determination of my oil if you have the opportunity to run 75-100 hrs/year. Pull a small sample and send it out. The lab should be able to say if the oil has more life in it or if you should change it. If you store for the off season, you should change it and then run it for 15-20 minutes before you fog the engine and store the boat.

As every one has said, oil is cheap insurance, change it, very true, but not always necessary.

Ken

minxguy

Robert, I am sure that any of the oils you mention will work very well for the 20-25 hours of use. chances are there will be plenty of service life in the used oil.

Ken

Hydrocruiser

15W-50 SilverCap is good stuff.

The M-1 V-Twin...Amsoil Racing 20W-50...Redline 20W-50...Motul 15W-50 would have a more hefty additive pack and base and would be worth considering if you run hard and race.

Robertjr

Amsoil Racing 20w-50 is no longer available,It's Gonna be Amsoil Dominator 15w-50, Amsoil"standard" 20w-50 or The Amsoil Motorcycle 20-50. So I realize I might have a short change interval, But out of these three, which has the best package of additives and such? Amsoil because have commercial acct. and great results although not "scientific". I want the best between these three. Cmon, you guys are the oil experts, I'm just an Electrical contractor!!!!................Roberjr

cloudmaster_321

I was on the Amsoil website yesterday, it still shows the Racing 20W-50??
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Nevermind, i was seeing things, it did go to a 15/50, wonder what they changed....

cloudmaster_321

I have a mild build 502 MPI putting out approximately 500hp. It has had 8 hours of dyno time for break in and tuning on Brad Penn break in oil, and just under 2 hrs on the lake with the break in oil. I changed the oil at 10 hours and put in the Brad Penn semi-syn for winterization. At what hour mark would it be recommended to go the the full synthetic??

I do run the boat hard occasionally. But my wot runs are about 3 minutes, then i run out of room and need to throttle back usually.