Oil change intervals for a rarely-driven vehicle

Messages
401
Location
Largo, FL
Here's another reminder for you all to change oil in your infrequently driven vehicles according to time and not mileage: Vehicle: 1985 Volvo 245 DL Oil: Mobil-1 Tri Syn 10W-30 Miles on Vehicle: 217,747 Miles on Oil: 2,150 Time on Oil: 18 months Al: 1 Cr: 0 Fe: 4 Cu: 8 Pb: 138 Sb: 0 Mo: 4 Ni: 0 Mn: 0 Ag: 0 Ti: 0 K: 0 B: 0 Si: 27 Na: 3 Ca: 1,945 Mg: 32 P: 342 Zn: 815 Ba: 0 SUS Visc: 55.7 Flashpoint: 375 Fuel: <0.5 Antifreeze: 0 Water: 0 Insolubles 0.6 This vehicle is a candidate for an Auto-RX treatment, which is probably what I'll do next. It's getting driven a bit more now than it was, and I'll follow up the Auto-RX with a shorter interval and another UOA to see where things are. I've already read here and heard elsewhere that a thinner synthetic like Mobil-1 is probably not the best choice for an infrequently driven vehicle or a vehicle that spends time in storage, and that a 15W-40 diesel truck oil would be more appropriate. Since I'm already using Chevron Delo in another vehicle, that's probably what I'll switch this one to.
 
Messages
243
Location
Reno Nevada
High lead with low copper is strange. I always see silicon go up with infrequent use. The crankcase is not a sealed system and dust gets into everything eventually.
 
Messages
903
Location
CA
If it were me, I'd retest. I'd want a little more evidence than one cheapy $20 oil analysis before I ran to the bank. Mistakes are made. A TBN reading would be nice, especially in these conditions. I doubt a low TBN results in high Pb though. More than likely, a low TBN would give high Fe numbers.
 

Al

Messages
19,154
Location
Elizabethtown, Pa
quote:
Originally posted by satterfi: If it were me, I'd retest. I'd want a little more evidence than one cheapy $20 oil analysis before I ran to the bank. Mistakes are made. A TBN reading would be nice, especially in these conditions. I doubt a low TBN results in high Pb though. More than likely, a low TBN would give high Fe numbers.
I totally agree. The Phosphorus is not right . I wonder about the lead. And the Iron seems too low. I have very little confidence in this analysis. [Frown]
 
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