How often do you change your motor oil?
 

I have a 1999 HP500 with about 120 hours on it, I run Mobil 1 15-50 with a Mobil 1 oil filter and have been changing the oil every 25 hrs. We have a 20 minute idle to and from the dock/lift, and I'm concerned about all that idle time, hence I have been changing the oil so often. What do you guys think?
TGIF,
MD

Should be okay with every 25 hours.
I also do it every 20-25 hours.


Another very important thing to remember is not only hours on the motor, but time as well.

Even if you only put like 10 hours in 3 months, you should change it anyway. Engine oil can get very acidy(corrosive) from combustion byproducts.

3 months is about the longest I'll leave oil in any engine.

BD,
Thanks, the last time I changed it was in Aug, so it appears to be working out about right! What oil/filter do you use?
MD

Dean,

I usually just end up using the Merc Tall Filter. I haven't experimented too much yet. It's just too convenient buying it at the marina. :cool:

Changed oil every 20hrs or unless we were doing some unusually high rpm runs like a Poker Run or racing around burning gas at WOT all weekend! Oil was allways still just a couple shades darker then it was when clean but i still felt better changing it......till i switched to RedLine then i changed oil every 30-35 hrs and it was the same as the reg oil.....plus the $8/quart makes me stretch it out a little longer! :D

Oh by the way...I used the AC Delco PF35L filters only but here is a list of the filters that should fit the 454/502 engines:

Oil Filter
FYI:The thread type on the filter is 13/16-16.
Fram:PH5,PH13, HP4
Pureolator: L34631
Purolator Pure One: PL34631
AC: PF1218 AC Delco PF35,PF35L (synthetic) PF1218
Motorcraft: FL-12A
NAPA: 1060
Wix: 51060, 51061
K&N: HP3002
Amsoil: SDF-24
Hastings: LF279
Fleetguard: LF653
Mobil 1: M1-302

HP500s also. Every 20 hours with Merc oil and their "racing" filter.

Change oil every 20-25 hours / use Valvoline 20-50 Racing oil with Wix filter. But like Wally said - It depends on the type of running.

We change once a season or every 20hours, whichever comes first.

500 efi'S

20 Hours Max

Mobile 1 15W-50

Fram HP4

This worked great on my last boat. 200 Trouble free hours.