Vehicle is an '07 Toyota 4Runner with 1GR-FE V6 engine, 205K miles, first 164K miles were poor oil change discipline by original owner at ~20K intervals. Timing chains, guides, tensioners, and sprockets replaced with Toyota components at 175K due to chain elongation and recurring P0016 error code.
I've been running Pennzoil Platinum High Mileage 5W-30 at ~5K OCIs since the timing chain replacement, no startup noise. Seeing how well the new D1G2 Valvoline synthetic high mileage oil did in my wife's vehicle, I went this route on my oil change yesterday. No compelling reason for the change from PPHM other than inventory simplification. Oil filter is a Toyota part from the dealership.
The engine was warm when I did the change yesterday, and no startup noise after the refill. Filter is a top-of-engine mounting design and went on empty as usual.
This morning, the engine made a noticeable rattle on initial cold startup. Noise stopped after ~1 second, very brief. The oil pressure idiot light went out right as the engine started, and was out during the short burst of noise. I shutdown and restarted, no noise. Drove to the gas station and refueled, no startup noise afterward.
Any thoughts? The only two variables in play are the oil filter and the oil. My thinking is either the ADBV in the new filter is defective, or maybe the additive package in the new oil needs time (heat and pressure) to activate while the previous additives are flushing away. Current plan is to continue running it for a few days while listening for the startup noise, and swap the filter if it continues after the oil has had time to "settle in".
I've been running Pennzoil Platinum High Mileage 5W-30 at ~5K OCIs since the timing chain replacement, no startup noise. Seeing how well the new D1G2 Valvoline synthetic high mileage oil did in my wife's vehicle, I went this route on my oil change yesterday. No compelling reason for the change from PPHM other than inventory simplification. Oil filter is a Toyota part from the dealership.
The engine was warm when I did the change yesterday, and no startup noise after the refill. Filter is a top-of-engine mounting design and went on empty as usual.
This morning, the engine made a noticeable rattle on initial cold startup. Noise stopped after ~1 second, very brief. The oil pressure idiot light went out right as the engine started, and was out during the short burst of noise. I shutdown and restarted, no noise. Drove to the gas station and refueled, no startup noise afterward.
Any thoughts? The only two variables in play are the oil filter and the oil. My thinking is either the ADBV in the new filter is defective, or maybe the additive package in the new oil needs time (heat and pressure) to activate while the previous additives are flushing away. Current plan is to continue running it for a few days while listening for the startup noise, and swap the filter if it continues after the oil has had time to "settle in".
