Thread: 2008 Mercury optimax 75hp

I don't know what DFI is, but the oil shown is a "blend" which means it is not a pure synthetic. If you are looking for a true synthetic, this is not it. That being said, I am sure it will work fine.

Yep, it will do fine. TCW3 is a high standard, if it meets it, run it.
I usually run Quicksilver TCW3, but on occasion I have run Penzoil TCW3 with no problems.
BTW you can get a gallon of Penzoil TCW3 from Amazon for around fifteen bucks a gallon, heck of a deal.

Be careful, some of these new DFI motors run a different spec oil. Check the specs real close because I have read where they will not mix.

Yeah was kinda worried about the DFI part. I think it burns a little different

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I've heard old school machanic's that say don't use Pennzoil.

But then again heard old school auto mechanics say don't use valvoline oil

Originally Posted by Mbsbeek

But then again heard old school auto mechanics say don't use valvoline oil

Used to get and read Bass and Walley boats religiously. They were a magazine dedicated to performance and tons of maintaince Articles.
They did several reviews on oils over the years. Only Pennzoil they ever recommended was their pure synthetic for high rpm race motors. Other than that it was way down the list for outboards.

I was told the same about not using Pennzoil.

Best I could figure out was that DFI engines do not mix the gas before injection. They inject both at the same time. There are mainly only two manufacturing DFI Mercury and Quicksilver.

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