View Full Version : Oil/Plug Recommendations?

08-29-2004, 03:46 PM
I have a '94 PS 205 with the 275 EFI engine. There are 450 hrs. on the motor. I am doing my first service on the engine (recently purchased the boat) and I have a couple of questions:

1) The previous owner used SAE 30 oil. I am thinking of switching to Mobil 1, but, I am looking for the best ballance of protection/power/fuel economy. Is Mobil 1 the best way to go? If so, what is the best weight? If not, what is the best weight dino oil to use?

2) I want to to replace the spark plugs. The current plugs are ACDelco MR43T. I have read somewhere (JimN, I think) that the best plugs to use are MR43TS (a hotter plug). Is this true or should I stick with the MR43T?

Thanks for the help.


08-29-2004, 07:17 PM
I think the TS just have a stainless washer..AC Delco MR43LTS plugs should work for you. http://www.shipstore.com/ss/html/ACD/ACDMR43LTS.html

30 Weight or 20w50 will work fine without Mobil 1. You change the oil on a boat every 50 hours or so. The benifit of Mobil 1 is thermal breakdown over a large number of hours. Save your money and buy a good filter.

08-29-2004, 11:54 PM
MR43LTS are for the motors with Vortec heads. Use the MR43T. The LTS have a longer reach and you don't want to have the plug going into the chamber too far.The marine plugs have a stainless body as well as washer.

MC has been shipping their boats with Pennzoil Marine 15W30 and PZ-3 filters since '99. If you have room to get a longer filter in and out, use the AC PH-1218. It has more surface area and good anti-siphon valve, so you don't have to worry much about dry startup. I have a 5.7L TBI in my truck and use this filter. I got the truck 3 years ago and it's a '90. As far as I know, nothing more than change belts, hoses, tuneup parts and oil seals since it was new. My guess is that it has over 200K miles on it.

08-30-2004, 08:37 AM
Here is the plug info for the Non-Vortec head.

08-30-2004, 10:17 AM
JimN (or others), in a post on the old board you mentioned that the MR43TS performed best for non Vortec engines. Do you still feel that the MR43TS is a better plug or as you stated above, should I stick with the MR43T?



08-30-2004, 10:45 AM
As I said in my last post, use the MR43T. If you look at your plugs, the tip should be wheat colored. If it's white, go to a cooler plug or address whatever is causing it to burn too lean/hot. If they're black or fouled, address whatever is causing this(low compression and rich carb adjustment are common).

When I typed TS, I musta been havin' one of my spells.

08-30-2004, 11:18 AM
Here is Napa's cross reference to that plug:

Bosch Spark Plug BSA7568 MR43T $ 1.09
Autolite Spark Plugs Spark Plug ASP144 MR43T $ 1.19
Champion Spark Plugs Spark Plug - Copper Plus CHA121 MR43T $ 1.19
AC Spark Plugs Spark Plug - Rapid Fire AC 10 $ 4.69

08-30-2004, 11:50 AM
Thanks! MR43T it is.