I don't want to burst your bubble but the 3.5 is not a Honda/Acura engine. The engine is built by Honda but to different specifcations for Saturn. Even Honda and Acura engines are built to different specs as fuel requirements are not the same.
I am not saying the Saturn engine (built by Honda) is bad, I just think maybe the salesperson fed you a little too much sales pitch. I have heard it myself from a Saturn dealer, same goes for some of the transmissions, built by Honda but to different specs.
Based on what it sounds like the dealer told you about the vehicle, I would have a hard time trusting them on the oil.
The J35A3 was also used by General Motors in the 2004-2007 Saturn Vue, though it utilized the cast-iron crankshaft from the J35A4 rather than the forged-steel version of the J35A3. GM refers to it as the L66.
J35A3
2001 - 2002 Acura MDX
2005 - 2008 Acura RL
2004 - 2007 Saturn Vue L66
GM L66 engine
3.5 L L66 V6 in a 2006 Saturn Vue
The L66 is an OEM V6 engine built by Honda but sold by General Motors in the Saturn Vue SUV. The L66 was acquired as part of a swap with Honda, who received the Circle L 1.7 L Diesel straight-4 for use in European Civics.
It is a 3.5 L (3471 cc) SOHC V6 with VTEC Variable Valve Timing and is made by Honda in Anna, Ohio. The same engine, the J35A3 is used in Honda's Acura MDX SUV. It is built at Honda's Anna, Ohio engine plant. Transmission built in Honda's plant in Russells Point.
It is interesting to note that the parts content sticker on the 3.5 L Vue states the country of origin to be Japan for both the engine and transmission.
In the Vue, the engine produces 250 hp (186 kW) and 242 ft·lbf (328 N·m)