04 Tacoma 240K - High varnish, some sludge was running T6 10-15K

Messages
6
Location
Texas
So I just finished replacing the valve cover gaskets and plug seals on the 2004 5VZFE Taco. I've been using Rotella T6 on about a 10-15K change schedule with a Toyota oil filter. My daily driving is 25 mins highway and about 40 mixed stop and go (traffic AM, vs PM) for 20 miles each way. Pulled the covers and there's quite a bit of varnish and a bit of sludge, the PCV needed cleaning, but the hoses were still good and the intake port was clear, so it was breathing, but not as well as it should obviously. I had a '95 that totally sludged up, but that year had a problem with the airflow. Obviously need to start changing oil more often, but is the Rotella Gas Truck a better choice now? Looking for more detergent action, seems like the test results show higher additive levels for that over T6. Can faces look OK and it does have a negative crankcase pressure (put saran wrap over oil fill port and it was getting pulled down pretty well.) [Linked Image] [Linked Image]
 
Messages
17,717
Location
NH
What was the factory interval? 5k or 7500? IMO it's not looking that bad. I'd run no more than 10k and go from there.
 
Messages
1,337
Location
texas
You have been running the Rotella T6 the entire life? I would say shorten the OCI a bit and keep going. its a 16 year old engine with 240K miles on it. You could easily double that amount of varnish and baked on build up and it will still run fine. That said an good high detergent oil is Pennzoil Ultra. A ran that in a new "to me" van I got and the oil turned black after about 1000 miles. Next OCI it tool about 2000 miles. I was thinking the PUP was crap but nope it was cleaning the old sludge out. After about 4 5K OCIs then it was coming put the sump like pancake syrup colored. No inky black at all. Just a dark amber tent.
 
Messages
3,031
Location
Florida
If you check out the photos I posted here of my 2003 Tacoma with 10,000 mile intervals on Mobil 1 5/30 it would probably make you switch.
 
Messages
2,201
Location
WA
Originally Posted by Ram02
Shell/Pennzoil haven't changed I see the waxes they still maybe using in there oils .
Curious where or how can you see the wax? I put PP along with a few other oils (including another very good syn) in freezer for a week and PP looked the best. It looked like fresh out of the bottle whereas other oils got foggy. Not saying it's the best test but you would think the wax shows up at low temps.
 
Messages
3,013
Doesn't look bad to me at all. You are at 240k miles? Why not move to 7500 for the remaining life of the engine and use an oil a little more on the cleaning side that the T6? I'm a Mobil 1 fan but PP or Castrol Edge? Others could work just fine but this is what I would stick too. Just my opinion.
 
Messages
1,775
Location
Kingston
It looks very similar to my 240k mile 305 that's 37 years old. Not exactly sludged up, but the inside of my valve covers have some buildup that looks the same as these photos show. I'm sure mine got there before I bought it and I don't know the original oil change history. Someone in the past circled the 7500 mile oil change interval shown in the owners manual so maybe that's what they did. And that would be on old SF and SG rated oils for a while at the beginning of the cars life. The past 10 years I've done full synthetic m1, Pennzoil platinum, etc every 3-6k. Usually 3k now, but when I did a long highway commute I went beyond 6k.
 
Messages
1,135
Location
Pacific Northwest
I don't see a problem here at all. That looks pretty good for 15k oil changes. I'd be curious to mike those cam lobes and see what kind of wear numbers you have. Bet the wheels fall off that truck before you wear that engine out.
 
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