Oil Change Frequency with Synthetic Blend Oil

[bulwnkl]

Be advised that most current engines' need for shorter OCIs stems from damage to the oil from fuel dilution. If you're not monitoring your oil through analysis, you're a blind person making a WAG estimate in the dark.

As to 5W20 vs. 5W30 in these engines, volumes of hard data show lower wear with the 5W20, so there's no argument over what works and protects best in this app.

 

[wmzda5]

the mazda5 comes with an oil cooler, reducing any need for such short oil change intervals... 3000 miles is what you'd probably want to do with conventional oil instead

Then how come here in Canada oil change interval is recommended at 8k km? With regular motor oil.

 

[Kojack]

hell in my truck i change every 25000 miles. I only us amsoil oils in my vechiles, where amsoil don't have an oil filter app for the 5, i have to change the oil every 10,000 miles.

 

[Zenderfall]

Guys, we seem to forget something when it comes to changing oil:

THE FILTER ALSO GETS CHANGED.

Meaning this: Whether you get good oil, bad oil, cheap oil, expensive oil, is only part of the equation. Filters are not all the same, and whether you pick a .99 filter (they exist) or a 14.99 filter changes the outcome. Some filters probably only last 3000, and some may last 20,000 (I really don't know)

For this reason, if we ever have to do comparisons between vehicles at the 200,000 mile mark, and check engine wear, if the two vehicles are using two different oils AND two different oil filters, nothing can be compared.

 

[TheMAN]

Then how come here in Canada oil change interval is recommended at 8k km? With regular motor oil.

there should be 2 different maintenance schedules.... one is "normal" and one is "severe"... probably 1% of all owners out there fit "normal"... everyone else has to follow "severe" based on where they drive and the conditions its driven in... you don't have to drive the car hard to even make it into "severe"

 

[shpankey]

Text redacted

What I have is information from text redacted thousands of engines and used oil analyses over the course of years. And numerous publicly posted UOAs on various free-access websites (such as, but not limited to, BITOG (bobistheoilguy.com) and NASIOC(.com)). And an understanding of what some of the differences between labs' analytical methods and capabilities do to impact results for comparative purposes. And the independent lab testing of M1 which has recently been published for all to see. Check Jobbersworld (IIRC?) for that testing.

M1 doesn't meet the sequence IVA test requirements, and it's not even close. It hasn't for quite a while now (as measured in years and months). Hopefully, XOM has reformulated quite recently and is now compliant again and no longer allowing excessive iron wear. However, even if they have, I will neither give them my business nor my recommendation because of how long and how significantly deficient they were. Even now, there's no acknowledgment of the problem. There's just a renewed ad blitz to try to get people to buy the product.

Hmm, interesting. I have to agree I've always noticed higher iron wears than other oils too. I made this connection in my mind but never really thought too much about it, until now.

I know 0w-40 M1 is in a class of its own in regards to other M1 oils, so I wonder if even the mighty 0w-40 has high iron wear too (?).

I'm using PP 5w-30 now but I have 10 quarts of GC on standby and after a couple UOA's on them, if all is well, that's what I'm sticking with. Along with OEM filters.

 

[MD5]

I've put over 600k miles on several personal cars and I always use M1. I had a 1995 Honda Civic with 140k miles on it when I broke a spark plug off in the head.

The mechanic I took it to removed the head to have it machined and called me to ask how I maintain my car. I told him M1 every 4k miles and he said "that explains it". I asked "explains what?", he replied that the head and cams looked new. There was no discernable wear.

Simply put, I've had good luck with that regime, and I'm not about to fix what isn't broken.

I've got 90k on my 5 now, and I'm about to take a 1,600 mile road trip to Colorado Springs tomorrow.

 

[mpvue]

it simply amazes me the amout of discussion and misinformation motor oil is resposible for.
it's very simple:
if your car is under warranty, DO WHAT THE MANUAL SAYS. so, stick w/ 5W20/5K.
if you are out of warranty, well, experiment if you like.

why complicate matters?

 

[bulwnkl]

The M1 0W40 may well have remained a good fluid despite the 5W30 (and, IMO, likely other grades) being a dog with fleas. The data that's publicly available is specifically to do with the 5W30, and the UOAs for some of the other grades look pretty poor to me, too.

 

[Haggerty00]

I change my oil in the Speed3 every 10k or so. I used to use 5w30 Mobil 1 or Amsoil, but now I use 5w40 Turbo Diesel Mobil 1 oil for the smoking issues the Speed3's have. I plan to use 5w30 M1 every 10k in our new Mazda5 with first change around 2-3k.

 

[was98strat]

given that the manual requests 5w20 oil wouldn't 5W30 decrease your fuel economy and be a potential warranty issue if you ever had an oil related problem?

Oh, and from what I've been told by MAzda the 5w20 they use is already a synthetic blend.

 

[rscottg]

it simply amazes me the amout of discussion and misinformation motor oil is resposible for.
it's very simple:
if your car is under warranty, DO WHAT THE MANUAL SAYS. so, stick w/ 5W20/5K.
if you are out of warranty, well, experiment if you like.

why complicate matters?

It's simpler that way.

I run Amsoil 5w20 because it's API certified unlike the 0w20 full-synthetic I run in my Honda. When the engine is off warranty in a year, I may or may not change to something else.

 

[mars1100]

ok, here it is right out of the 2009 Mazda 5 owners manual:

Schedule I (USA):

6 months, 12K KM or 7.5K miles = replace engine oil and oil filter.


Schedule II: (Canada, Puerto Rico and as I read "extreme conditions")

4 months, 8K KM, 5K miles = replace engine oil and oil filter.

REcommended oil:
Use SAE 5W-20 engine oil (USA and Canada)

(Mexico) if 5W-20 is not available use 5W-30.

My opinion(not as a professional):
I have always used M1 on all of my newer vehicles(1998 and newer models) and have never had so much as an oil leak in any of my engines all have had over 100,00 miles. My older vehicles which I did not use M1 in have all had oil leaks as well as other engine issues.

I say use the recommended service interval in the manual whether or not you use synthetic.

Just my contribution to this aging post.

 

[georgecastaneda]

i have a 50.000milles and im using castrol full synthetic 5W30 is that ok?