Conventional turning dark fast

Status
Not open for further replies.
Originally Posted By: gallydif

Lol. Don't listen to these people that believe in thin oil. 20w-50 is what the taxi cab company uses next to me in their vehicle fleet of ford crown vics here in miami. Anyways back to the topic- color doesn't always tell the story. Could be this has a higher cleaning detergent and that's what it's doing. Cleaning your engine! Get a used oil analysis whenever you decide to drain it.


I, for one, 'believe' in thin oil. It does exist and it does work, in its prescribed applications. I don't believe anyone suggested he use a thin oil. I'm assuming 5w-20 would be a thin oil, in this case. To be honest, I'm usually on the thin side of the argument when it's within recommendations or is the only recommendation but c'mon... OP has a 40+ year old car, he implies it burns at least some oil, and he lives in a tropical(?) climate. I think one, two, three strikes and he's probably going to be A-OK using 20w-50.

BITOG has taught me that color means next to nothing, unless it's a color like gray, then that means serious trouble. But in the case of it just turning dark fast, meh, I think you have nothing to worry about until a used oil analysis tells you otherwise.
 
Yeah technically where i live it's a sub tropical climate , the coldest temps during winter are around 0c ( 32 F ) and te hottest during summer are about 40c or 100 F, as of today the oil is pretty dark , almost black , i hadn't thought that it might actually be cleaning my engine, it hadn't had an oil change in at least 2 years before my last one though, i pulled the rocker covers the other day to adjust the valve lash and it was dark but i saw no varnish or sludge
 
Originally Posted By: FordCapriDriver
Yeah technically where i live it's a sub tropical climate , the coldest temps during winter are around 0c ( 32 F ) and te hottest during summer are about 40c or 100 F, as of today the oil is pretty dark , almost black , i hadn't thought that it might actually be cleaning my engine, it hadn't had an oil change in at least 2 years before my last one though, i pulled the rocker covers the other day to adjust the valve lash and it was dark but i saw no varnish or sludge



What about providing some pictures here?
 
Originally Posted By: FordCapriDriver
Pictures of how it looks under the valve covers you mean?


Yes appreciate that , and if possible pictures of oils on dipstick and/or blot paper would be helpful too ... if it isn't too cumbersome for you .
blush.gif
 
The Shell is cleaning things up a bit, no big deal. Keep doing what you're doing. We used 20w50 conventional all the time back in the 80s when 5w30 was junk and engines went 200k+ miles with no problems. The rest of the car wore out. That being said, 5w30 is no longer junk, neither is 5W-20 or 0W-20 - but I wouldn't use them in a 40 year old car.
 
Capri,
First, I don't think the viscosity 40 vs 50 has anything to do with the darkening.
Besides a cleaning effect it could be something in the Shell just darkens more when it goes past/through hot spots, like he oil ring lands.
 
Status
Not open for further replies.
Back
Top Bottom