Emissions test - engine at high rpms
 

I went to get my automatic 1990 Volvo DL 250 inspection sticker renewed. The place that did it had a machine with two hoses. One went into the muffler the other hose went inside the car....it looked like the guy put the hose near the ac vent. While in park, he rived the engine at a pretty high rpm for two full minutes. Being my car is so old, I was scared that it might blow seals or mess up the engine somehow. Is this possible? Should I be worried? Was it necessary for the guy to do this at such a high rpm for so long?

Wait...Dl for desiel right? I didn't think they need to get tested?

They probably rev the car to warm it up. It burns cleaner when warmer. Well they do for gasoline cars.

No diesel here in the U.S. in that year.
It might have failed the first time. Then they need to run it at a higher RPM to get a good reading.

no, it's regular fuel...not diesel. is it bad for the engine to do that? should i worry about any damage?

Reving the motor....Not to worry.

its not like he was redlining it or anything to those two minutes?

Its fine.

It's an automatic, so I can not tell if it would red lined or not.

I checked my transmission fluid and it was low about 3/4 of a quart. So I refilled it. About 8 months ago I had the outter transmission seals replaced. I kept an eye on the transmission fluid and it stayed at a steady level. It was about 3 months since I checked it since I put 3/4 of a quart in today. I guess I must have a new leak. Could this be from the guy reviving my engine so hard from the emission test?