On 11/19/2021 11:24 AM, gtr wrote:
> On 2021-11-19 07:52:07 +0000, sms said:
>>> Again very few models.' OTOH, Subaru smartly make the oil filter very
>>> easy to access from the top on many models.' So one can 'vacuum' the
>>> oil out from the top (via the dipstick hole) and replace the filter
>>> w/o lifting the car a mm.
>>
>> While an easily accessible (from the top) oil filter is great for home
>> mechanics, repair shops don't really like it.
>>
>> Sucking the oil out through the dipstick hole is an especially bad
>> idea, even though it's less trouble than removing the drain plug. You
>> leave a small amount of the worst old oil, full of contaminants.
>> Sediment collects in the bottom of the pan and is the first thing to
>> come out the drain. Sucking oil out through the dipstick tube wont
>> remove as much sediment.
>
> Don't those cars with on top oil filters still have oil pan drain plugs?
> I've never done it but how hard can it be to remove a single drain plug?
I'm sure that they have a drain plug but it may be a pain to get to so
pumping the oil out through the dipstick hole is the normal procedure
for draining the oil. We had one oil change chain in my area used to
advertise that they drained oil through the dipstick tube, but they soon
dropped that procedure when they realized the drawbacks, or at least
they don't advertise it anymore. The plus side to pumping the oil out
through the dipstick tube is that there's no danger of stripping the
drain plug threads or forgetting to use a new drain plug gasket. These
quick-change oil places aren't using trained mechanics and there are a
LOT of horror stories of damage that they've caused.
In my area, the dealers periodically mail out coupons for very low cost
oil changes. I got two coupons for $8.88 oil changes, and that includes
synthetic. Recently they sent out a coupon for a free oil change with a
food donation to a local food bank. Of course their ultimate goal is to
get your car in there and then try to sell you a bunch of other stuff
like air filter changes, new tires, engine flushes, etc..
My wife complains that I change the oil on all our cars because it takes
me about an hour and I could use that time to clean the garage. But to
drive the car to an oil change place, get the service order filled out,
and get the oil changed would be just as long if not longer. I use OEM
filters and I use the proper oil. I recall the Toyota dealer once using
whatever bulk oil they had even though it wasn't the right oil and I had
them do the oil change over again with bottle of oil. My brother-in-law
had a garage and when 5W20 first came out (on Hondas) he was buying
cases of it from the Honda dealer and the parts guy laughed and said
that the dealer's service department just used 5W30 on the vehicles that
specified 5W20 because 5W30 came in bulk.