M-1 5W30; 3200mi, '01 Sienna 1MZ eng

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First post - new member. I've got an oil change coming up, afraid to extend beyond 3K miles due to the history of Toyota's 1MZ engine. Currently running Valvoline Synthetic. Opinions please.
 
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Your post says M-1 but you say it is Valvoline Synpower I assume. Looks good from here.
 
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kevinf

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ThirdeYe is correct, the next analysis will be on the Valvoline SynPower in the crankcase now. I purchased the car in Sept. of 2007 at 87K miles and was doing some cleansing oil changes since I didn't have the full history. That's why the intervals were so short. It's my wife's ride and she is currently driving about 9K mi per year. So can I stretch to 4,500mi/every six months, or be safe and keep changes at 3K? Can I switch to Penzoil YB or other high quality conventional oil, or should I stay with synthetics due to the reputation of the 1MZ engine?
 
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Even on a 'sludger' engine, you can easily do 7500 miles on synthetic, so yeah, your planned 4500 miles works just fine. Silicon looks really high for the miles - might want to look into your air filter.
 
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Kevin, I have a '98 Sienna (1MZ-FE). I bought it in 2001 w/ 62k miles on it. It now has close to 160k. Mainly shuttling the kids. For the majority of it I've done ~8k OCIs using Mobil1 (10w30, 0w30 and 5w30). A Toyota mech was in it at around 142k for valve cover gaskets and timing belt - said the engine was clean. I heard about he sludge issue soon after getting the van. Did a lot of web research those first couple of years. The majority of vans seemed to be sludging in under 50k, and the '99 and '00 seemed to the the worse - some sludging in 20-25k - the earliest I saw was 14k. I've only seen a couple of post of Sienna's sludging after 50k. So, it seems to me if you have a sludger, you likely would have already sludged. There are a bazillion '98-'02 Sienna's that haven't sludged - many owned by folks that don't know about the issue, and forget to chg their dino for way too long. Just look at the numbers (from what I've read) - you had that surge of vans sludging that first couple of years, and now you don't hear much about it - even though these vans are getting old and high mileage. And some of the sludge stories - there were numerous folks that claimed 3k OCIs (supposedly provided Toyota w/ receipts, etc), there was one guy that claimed doing 6k OCIs with M1 - and they sludged. So it seems if a person owned one of the sludgers, they were doomed almost regardless of the oil or OCI. (?) What I take away from all this - these engines may be tough on oil, but something kinked on the production line (or from some supplier) that broke the camels back in a small percent. And if you haven't sludged by 90k, you're out of the woods (imo). Proceed with caution (but I think you could relax the 3k). (Once again - my Sienna is clean and I've gone as far as 9k+ on M1)
 
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 Originally Posted By: stockrex
what was the root cause behind toyos sludging? narrower top end port sizes to raise head temp?
There are 2 concepts circulating around. Yours is one, and the other is the thermal delta (or temp difference) between the sump and the head, that stresses the oil.
 
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Chicago IL
 Originally Posted By: ericthepig
Kevin, I have a '98 Sienna (1MZ-FE). I bought it in 2001 w/ 62k miles on it. It now has close to 160k. Mainly shuttling the kids. For the majority of it I've done ~8k OCIs using Mobil1 (10w30, 0w30 and 5w30). A Toyota mech was in it at around 142k for valve cover gaskets and timing belt - said the engine was clean. I heard about he sludge issue soon after getting the van. Did a lot of web research those first couple of years. The majority of vans seemed to be sludging in under 50k, and the '99 and '00 seemed to the the worse - some sludging in 20-25k - the earliest I saw was 14k. I've only seen a couple of post of Sienna's sludging after 50k. So, it seems to me if you have a sludger, you likely would have already sludged. There are a bazillion '98-'02 Sienna's that haven't sludged - many owned by folks that don't know about the issue, and forget to chg their dino for way too long. Just look at the numbers (from what I've read) - you had that surge of vans sludging that first couple of years, and now you don't hear much about it - even though these vans are getting old and high mileage. And some of the sludge stories - there were numerous folks that claimed 3k OCIs (supposedly provided Toyota w/ receipts, etc), there was one guy that claimed doing 6k OCIs with M1 - and they sludged. So it seems if a person owned one of the sludgers, they were doomed almost regardless of the oil or OCI. (?) What I take away from all this - these engines may be tough on oil, but something kinked on the production line (or from some supplier) that broke the camels back in a small percent. And if you haven't sludged by 90k, you're out of the woods (imo). Proceed with caution (but I think you could relax the 3k). (Once again - my Sienna is clean and I've gone as far as 9k+ on M1)
Kevin, pretty good info above. The other thing with this engine is to keep the PCV valve and hose really clean. I limit my OCI to 5k (w/GC) because of short trips and cold temps. 115k so far so good. Your plan sounds good. BTW- Use OEM PCVs for the best results. IMHO
 

kevinf

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138
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Thanks for the info everyone. I'm going to keep using synthetic only on this car. I'm also only using Toyota OEM filters. I did a few short interval changes with some gentle cleansing using Marvel's and Seafoam and dino oil when I bought the car. I noticed the pcv valve was gummed up when I bought the car, and I replaced it, and the throttle body where the pcv valve dumps its load was filthy, so I cleaned that too. It's been a year and a half since I looked at the pcv and throttle body, so I plan to do that this upcoming oil change. My wife only drives this thing about 9K miles per year, but I can't stand the thought of once a year oil changes, maybe every 8-9 months. I have three kids under age six so I don't ever want her stranded due to a maintenance shortcut on my part.
 
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