Anyone using Pennzoil Synthetic on a 99' -200 Mercury HP EFI Motor?

[creekchub]

Prior owner of my set up was using Pennzoil Synthetic Oil for 15 years- I just blew powerhead and wondering if that oil had anything to do with situation? Another board guy told me that Full synthetic may not be the best choice for EFI engine....suggestions on using a semi synthetic blend instead-is that a better choice? Lastly, if my remote oil tank has full synthetic oil in there and I switch to semi synthetic -can the two oils be mixed or do I need to drain the oil ?
Thanks, BBC Guys!
Creekchub

[creekchub]

I would be sticking with Pennzoil :Pennzoil 550022771 XLF Marine Synthetic Blend Engine Oil (TC-W3) versus the Pennzoil full Synthetic- can I mix and start using with new powerhead

[DiawaKid]

I use Quick Silver Synthetic in my 2000 EFI 200. But I have the oil injector off mine and mix with gas

[DiawaKid]

They say once you start using synthetic, not to go back to regular I believe.

[mdtritn21]

Use the blended synthetic not the full synthetic. Even mercury premium plus is blended synthetic. I would empty the full synthetic oil from the remote tank.

[creekchub]

Since both oils are Pennzoil ( one being full synthetic other a synthetic blend(thats what I will switch to-any issues with mixing the two running new powerhead on motor?)
or do I need to take out the full synthetic?

[EuropeanAM]

Recommended oil is Mercury or Quicksilver Premium PLUS (which is a Synthetic BLEND).

Full synthetic is not recommended for your Steel-Sleeved Mercury Engine.

Definitely would recommend switching to Synthetic Blend.

[straffordengineer]

Recommended oil is Mercury or Quicksilver Premium PLUS (which is a Synthetic BLEND).

Full synthetic is not recommended for your Steel-Sleeved Mercury Engine.

Definitely would recommend switching to Synthetic Blend.

Don,

Why isn't a full synthetic recommended with steel sleeved engines? I would have thought a full synthetic would be better.

[bighaida]

Been using Ansoil full synthetic since 1991 with zero problems. Blew a head gasket when I overheated in some hydrilla. Decided to do both head gaskets at the same time. when I removed the heads everything looked brand new, zero carbon and shiny as chrome plating. The motor was 12 years old when this happened. Oh yeah, you can mix with zero problems.

[EuropeanAM]

Don,

Why isn't a full synthetic recommended with steel sleeved engines? I would have thought a full synthetic would be better.

Asked and answered many times on the forums (over six pages of such topics in the "search").

Oils used in our Mercury engines should be:

-FCW Approved/Certified
-TCW 3 (for 2-stroke)
-Provide superior CORROSION resistance
-Condition seals to help prevent hardening
-Provide excellent film strength to help prevent dry starts

While Synthetic oil base DOES provide several of these, there are specific corrosion, film, and seal conditioning benefits to traditional oil base as well. Hence, a BLEND provides the benefits of BOTH types.

Primary problem I've seen (repeatedly) with full synthetics would be gauled bores/pistons.