Engine Synthetic Oil Question

tr7driver · May 5, 2014

I have a 2005 GT vert with 35K miles on the 4.6 V8 engine. I have been using the Motorcraft 5W20 syn blend motor oil for the life of the car. Last November, just before I put the car away for the winter, I changed the oil and used Castrol synthetic instead of the blend.
Yesterday, I took the car out for the first time this season and I noticed that it blew some dark smoke upon cold startup twice. Only at startup. I don’t remember seeing smoke ever from this engine. This has me wondering if there is an issue with the synthetic oil or my engine, or if this is just something from letting the car sit.
Any ideas on this, other things to look for, or other information is appreciated.

Dino Dino Bambino · May 6, 2014

The dark smoke was probably from letting the car sit for a few months. The best thing you can do is take the car for a long drive on the highway (not driving like Miss Daisy) to blow the "cobwebs" out of the engine.

timjimmy · May 6, 2014

What it smoke with more of a blueish tint or black?

Noobz347 · May 6, 2014

Bullitt95 said:
The dark smoke was probably from letting the car sit for a few months. The best thing you can do is take the car for a long drive on the highway (not driving like Miss Daisy) to blow the "cobwebs" out of the engine.

Yep... Some new gas would a step in the right direction as well. Maybe a half a can of seafoam too.

SpartaPerformance · May 7, 2014

My Mustang blows bluish black smoke after sitting for the winter but thats only the 1st day.

tr7driver · May 8, 2014

Thanks for the replies. I also had Sta-Bol mixed in the tank when I filled it for storage, so I think it is a storage issue. I've driven about 100 miles and added some fresh gas yesterday, and the exhaust has cleared up.

Paul G · May 31, 2014

Back in April I started mine up for the first time, a whole bunch of crap blew out the back and then cleared up...
It's normal. Oil sitting at the bottom of the pan for 5/6 mos, the crap gas with ethanol essentially turns to water..

Marine Stabol is the best to use.

Gearbanger 101 · May 31, 2014

Seafoam is a great fuel stabilizer as well. I wouldn't trust any of them after 5 or 6 months though.

Engine Synthetic Oil Question

tr7driver

Member

Dino Dino Bambino

timjimmy

Active Member

Noobz347

Stangnet Facilities Maint Tech... Er... Janitor

SpartaPerformance

tr7driver

Member

Paul G

Active Member

Gearbanger 101

Straight Outta Locash

Similar threads

Engine Synthetic Oil Question

Member

Active Member

Stangnet Facilities Maint Tech... Er... Janitor

Member

Active Member

Straight Outta Locash

Similar threads

Privacy & Transparency

Privacy & Transparency