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.
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.